It is probably the Price Tag on the development software.
RPG Maker VX Ace is $70 and used to be $90. I got VX for $60 and XP for $40. The 3 most ideal programs cost a little too much money to some people. Not to mention XP is the only one with a Starter Kit right now as CNG's Kit is virtually dead and mine still need some key features to be demo material and some major database and visual after that.(Visual will probably be backgrounds to replace the windows in some scenes.)