It's pretty simple. I have the money, they want my money, why do I have to be the one to go where they want? They have to cater to me if they want my money, or else they get nothing (I'm looking at YOU, THQ).
I do want to play games I enjoy but this game isn't something I can't easily do without, I buy about 4 or 5 games (perhaps more when I'm extra game-crazy) per month during peak season (anything outside of that three month period in the summer when there are no games coming out), if they don't get it out in time on the PS3, that part of my PS3 launch budget goes to some other (I'm anticipating getting likely half dozen games on the PS3 along with the system), equally enjoyable title from another publisher. Activision and other multiplatform publishers will have to appeal to me if they want my money by bringing me quality PS3 games because I sure as hell am not going to go out of my way just to play their games. Bring me PS3 games or they will get no money from me whatsoever.