They've got the "technology in place" to work on PC but there's "more work required" to make them shippable, and publishers shy away from that.
"As a developer we do not have final say in the sku plan for our games. That is the decision of the person investing the money, i.e. the publisher," reads the official on why there's no PC Brutal Legend, Costume Quest or Stacking.
"We have much of the technology in place to produce PC versions of all these games, but there is still some more work required to make them shippable and that costs money. So far, our publishers have not elected to fund that work," they continued.
"Not because they hate PC Gamers, but because they don't see enough financial reward. Double Fine does care about PC Gamers, and we always push for a PC version, and will continue to do so in the future. If we ever get super stinking rich here, with enough money to fund PC versions of our games, then we will go back and make them ourselves!"
Double Fine and their leader Tim Schafer have just announced a new puzzle adventure called Stacking, which has us playing as Russian matryoshka dolls, 'capturing' others to solve obstacles throughout the levels. See the trailer below - no PC of course.