first of all they could do as criterion did, as many mates before said , they released the pack with all included and the individual packs,with only one car , so if one wish only only 1 ship , he buy only 1 ship, if one wish 1 track buy 1 track, if he want it all, get it all

more option= more money, so the uberfans get it all, the one that want only that certain " piece" but isn't intersted in the other stuff and don't want to spend all the $ is free to get it, people aren't discouraged = sale assured

concerning the other main argument, about the interaction -online play- people who own that track/people who don't own and cannot play anymore
this apply only for tracks, i think
or if one race with a download ship and another one of the participants don't own that ship, will not see it?