Yes, the guys at Starwraith have made money. We've made some (emphasis on the word "some") money at MISoft, and a few others have as well. I think someone had an FPSC game published as well, though I can't remember who it was. But it isn't easy (I don't think anyone has gotten rich from it
yet), marketing is pretty rough if you don't have money to market with, lol. That's if you care to publish yourself though. We're in the process of publishing someone else's work for the first time, but that's an indie studio publishing an indie developer, so I'm sure that "doesn't count" by some people's standards. But there are quite a few people on TGC making really awesome stuff. If Cash doesn't find a publisher with Geisha House, I'll be amazed to be quite honest.
Now, if you're asking if mainstream studios use DBP, that's a different question entirely, and I can answer that safely and honestly with an emphatic, Benjamin-esque "NO." Not that I know of anyway. That's because it isn't universally portable to multiple platforms, there aren't as many DBP programmers (so finding talent is harder than it would be if using a C derivative), and there aren't college courses to teach DBP and stir up a real initiative to make it mainstream. But it's extremely capable, easy to use, cheap, and fun, and with an awesome community
. And we've seen quite a few people use DBP as a "stepping stone" to teach them programming fundamentals so they could get into advanced C stuff.
Just because no one has made millions from a DBP game/ app doesn't mean there won't be a first. In fact, I've always argued that thoughts like that are nothing short of discouraging and counter-productive, and are the very reason why no one has done it yet. Not that anyone has done that yet in this thread, but I'm saying that now to cut them off at the pass, lol. I'm still thoroughly convinced that we haven't seen the best of DBP yet, at its fullest potential, but we will in the near future