Because it's impossible to find out about or actually watch on tv/internet.
For instance, I use to follow the american Le mans league. CBS would actually air the races, with golf or tennis breaks every 45 min or so. It was great. Now its the Tudor United SportsCar Championship. But for some reason I thought it was also the WEC. took a while of googling to sort that all out. But more importantly I discovered the Continental Tire SportsCar Challenge during my research! WTF, how come this has been running for two years and I just found out about it. Mostly stock sports cars duking it out. YES PLEASE! hell they even run a detuned Z28! I wanna watch that! wtf..
Any ways have a GS.R spec z28 for your time