yamaha and suzuki get their loans through different lenders, it was very common when i was at honda for a guy to get turned down at honda on a cbr 600rr and then go get approved for a gsx-r 600 for the same price... so thats probably why he can get you the gsx-r and not the yamaha, i wouldn't suspect that he has any hidden motive to sell the gsx-r to you over the R6 such as dealer rebates or ensentives because they just sell themselves... but still sounds like they are being shitty about the situation