Doesn't Jive with both SJ's and Sean's posts over on SJG's boards.
first, there are new books for GURPS - but due to finances, they're PDF or POD only, and Sean, the GURPS and DF Line Manager, noted that GURPS was being subsidized by the Munchkin sales. GURPS, DF, and TFT are lines because "Evil Stevie" loves them, keeping them in sales a negligible profit.
Munchkin pays the bills. Car Wars The Cash Grab edition also pays bills. SJ, by all accounts I've read of him, is a polymath gamer...
Looking at where SJG's positioning vs the audience is quite telling... in the 80's, SJG was budget production and inexpensive products with lots of replay, and minimal component counts, by the 00's, OGRE was freaking expensive to get into... and the minis on map version was pricey as hell. The chipboard edition was almost as expensive as the minis version. A $100+ box... for what was once a $4 pocket box game. (Late 1970's)
SJG chases the money in the boardgame space, but SJ keeps GURPS available on the cheap path.
And, SJG pays well and on time.