I've never seen an auto contract have any restrictions, have you?The way you and Mike talk, it would have been perfectly fine for the previous owner of that Ram to require you to join a local Ram owners club as well as restrict your purchase such that you could never swap out or remove the ramboxes
Lookup deed restrictions on real estate or not, no skin off my back. I didn't make the law (or make it up). Real world vs make believe INGO land, I guess.
Personally, I try to be as educated as I can when spending the kind of money that real estate costs. If I don't fully understand it, I engage an expert on my behalf to ensure my interests are protected / represented.