The answer is because Capcom is run by idiots who dont know how to run a business, plus they seem to have a fear of money. Even though the DS has completly dominated over the PSP and is a system that is much cheaper to develop for they continue to give the PSP more support then the DS.
Sega and Capcom are the videogame equivalent to Dumb and Dumber, but with each company switching between the role of who's dumber every couple months.