commercial games I know of to date
Starwraith 1 & 2 (& 3?)
the 3d Pea Guy strategy game on the A-sock eclipse now cd (I think there was another DB game on there too)
Tito the bouncing alien
Driving success
3d Mah-Jong
A lot of authors don`t mention the language openly since that is often a good way to put the buyer off, you say "Basic" and they think of flickery text based games on the speccy or minesweeper in a little window with no sound on the desktop and they won`t even spend the time to download the demo, never mention it`s in basic if you intend to sell it, even if the compiler wrote optimised machine code with full surround sound and shaders (oh! wait a mo! DB does to a degree

) they wouldn`t so much as look at it.
I suspect one commercial company is selling games made in DB within their range, some of them are obviously C with a simple 3d lib and some are obviously VB or similar, but some of their titles look like they may be DB classic, you might like to look around the shareware and freeware sites and try to guess if any of the titles you see are made in DB, there are some out there.
Mentor.
1: P4 hyperthreading 3ghz, 1gig mem, 2x160gig hd`s, ATI radeon 9800 pro gfx, 6 way surround sound, 2: AMD 1.2ghz, 512mb ram, FX5200 ultra gfx, stereo 16 bit soundblaster, ups.