meh. I liekd TT, I still liek it (actually just did my first photo's in months on TT) however, I know it was an experiment for PD and not much more. I think if they do a TT 2 we'll see a betetr way of doing the purchasing.
the only issue is that you'd have an even greater range of pricing for bikes than cars. some bikes in TT would be 60,000 bucks or more, others would be no mroe than 3 or 4 thousand. so the pacing of the game's race winngins would be a hard thing to get right. you'd either end up with a Grand theft auto-like situation near the end where you had practically infinite cash, or, you'd have GT3 all over again.