I'm really glad this question has opened up the discussion and to see so many participating. I've intentionally waited a long time to answer because the longer I think about this, the more ambivalent I get. At first I was as annoyed as @Vincent by these lazy questions. If I saw one I could not help but roll my eyes and sigh. But after spending some time thinking about this, I think I've changed my POV. So below are my arguments for YES and NO. I'm aware that some of these arguments have been given before by other members.
1. There's no such thing as a bad question.
A question can seem like stupid/irrelevant/basic/lazy/... to you. To the poster, it might be an insurmountable problem. Every answer is a chance to teach, even if it is basic things. And in the future, this question and answer can be used to dupe-hammer similars.
2. It's a rep source for a reason.
This site, and the SE Network as a whole, is based on a single currency: reputation. It rewards desired behaviour and punishes undesired behaviour. If I'm rewarded for giving answers, why is it a bad thing to do?
3. Good answers can make a bad question irrelevant.
A good, substantiated, well-written, well-researched and clear answer may become a reference in itself, regardless of the quality of the question.
4. If I know how to help, why shouldn't I?
If someone has a problem, and I know how to help, and I'm willing to help, why shouldn't I? Wouldn't I be a real dick if I didn't?
5. Very little 'Help Vampires' come here meaning harm.
Most are well-intentioned people that just don't know any better. Either they don't know our policy, or they are really just clueless on how to even start a certain thing they want to accomplish. They had an idea or they saw something somewhere and they want to Do The Thing™. Maybe they didn't use Google or their search didn't yield results because they don't know the right terms. Coming down on them with downvotes and close votes just makes this community seem toxic and defensive, and may be harmful in the long run.
6. They are the vast majority.
Simple how-to and style-ID questions are the vast majority on this site, and always have been. If we could somehow create a super-fast delete system or a gated system and prevent these questions from appearing on the site, I'm afraid there won't be much left. And what's attractive about a Q&A community that doesn't have a steady Q&A supply?
7. There is no solution to this "problem".
I think this question from 2012, and this one from 2011, and this SO Blog post from 2011 and this Meta from 2009 are proof enough that lazy questions and help vampires are a constant on every forum and help community, and we are no exception. No matter how much we board up the windows, they'll still find a way to get in.
1. They bring us down.
They are harmful to the overall quality of the site. This site is meant as a resource for graphic design professionals, not for easy-to-google, click-this-button tutorials.
2. It turns away regulars.
Regular contributors can get really sick of answering the same question asked slightly different or asking people for more information on what hey want exactly. This can cause a drain of high-quality members and leave a self-serving community of easy rep hunters and tutorial seekers.
3. If we allow one, we allow them all.
New users can use already answered tutorial-on-demand questions to justify their asking a similar question. This in turn might just trigger even more TOD questions until there is nothing else left. They will become the noise that drowns out the signal.
4. Why should we do what others are already doing?
There are plenty of tutorial sites and Adobe help centers out there. Those mostly do a pretty good job. So why should we be just another one of those. Why can't we be the place for the Hard Questions?
5. They clog up the queues.
A lot of these questions are getting flagged as low quality, low effort, tech support, font-id, etc. The close and open queues are getting longer and longer, and fewer people are motivated to go through them. Eventually, the whole system will break down.
All in all I must say I'm leaning more towards the Yes side of things. I think reacting to a perceived threat by boarding up the windows is the wrong thing to do. I appreciate the sentiment of wanting to become The Reference for the Hardened Professional, but I think that's just not realistic given the SE model. You can spend hours and hours on SO Meta and SE Meta reading about help vampires, lazy questions, dupes, enablers, newbies, rewards and punishments (I know I did).
Fact of the matter is: you cannot solve this problem, it's impossible to draw the line between questions that are of too low a quality and questions that aren't. Which in turn makes it impossible to reward good behaviour and/or punish bad behaviour safe from on a case-by-case basis. And that's exactly how the system works now.