Brian, I hope I've never come across as antagonizing a new diver (Lord knows I spend enough time trying to turn new divers into better divers) ... but my response to your question would be to ask a question ... "why do you want to become a DM?"
Divemaster isn't just another level of recreational diver ... it's the first level of being a professional diver. For me, it entails a lot of responsibility. It's a level of diver that one aspires to when you want to work with other, less experienced divers ... people who are, literally, trusting you with their life.
To be honest, 25 dives isn't even enough for most people to become comfortable with the basics ... much less entertain notions of taking on the responsibilities of a professional.
If your goal is to gain knowledge, then I'd say that's laudable. You don't have to become a DM to do that. Or, if you do really want to become a DM, then gain the requisite experience and context first ... and I can't think of a single diver I've ever known who can do that with just 25 dives under their weightbelt.
I encourage every diver to take at least a Rescue class as quickly as possible after getting certified. That'll help you learn what to do in an emergency, as well as help you develop confidence in your basic skills ... it'll challenge most any diver with 25 dives. Take classes to expand your range of diving ... the specialties offered as part of the AOW are worthwhile for most, but not a necessity if you're lucky enough to hook up with experienced divers who are willing to mentor you through the fundamentals. And then dive, dive, dive ... it's the best education you can get.
But DM isn't so much about educating yourself on the basics of diving as it is about learning how to be a responsible dive leader. That takes more than just classes. It takes experience ... lots more than 25 dives worth. It takes the kind of judgement that comes from experiential context ... the kind that comes from logging lots of dives.
Finally, I don't think most of us would antagonize any diver for aspiring to this level. But many of us ... myself included ... feel that the dive community at large would be better served by raising the standards on the minimal requirements set by the certification agencies on entry into the DM program.
Asking a diver with 25 dives to even contemplate the responsibilities of being a dive professional is like asking a third grader what they want to be when they grow up. They might have some ideas ... but no real experiential context on which to base it.
... Bob (Grateful Diver)