Plenty of guys track and autocross with fake rims, they hold up just fine so I doubt the average enthusiast needs to bother themselves with whether their wheels are forged monoblock or not
I support legit companies because I want them to continue production of great styles and parts, for instance when BBS was in trouble lots of the eurotuner guys worried they were going to lose original concept designs forever thanks to knockoff wheel companies running legit companies out of business. I was asking why you want legit because if you are worried about the quality of replica's dont be. When you see those pictures online of a car with their replica wheel broken at the hub it was most likely because the guy slid into a wall or curb at 60mph or something retarded. They're not going to just crack daily driving.