Hundreds of thousands, maybe millions
I have no doubt they are competent designers and story writers and artists and sound engineers etc, but development for the PC platform on all recent R* games (GTA3 onwards) with the exception of GTA San Andreas has been rather poor and buggy.

I believe this is because they design their engine solely for the consoles they develop on, although I have no prove and this is just pure speculation on the way 1 I was treated by R* and 2 the fact that Vice City and GTA3 are littered with console related stuff inside.

John