I have three resins: the two NEO '49 Cadillac Club Coupes and the BoS 1958 Cadillac 75 limo.
My collection is mostly 1:24 diecast but I have about ten 1:18s. I knew full well that the resin models did not have opening hoods, doors, trunks or under carriage details before I bought them. Expensive, sure. But nowhere else could I get those particular Cadillacs so they were worth it for me. If I had the room and money, I'd purchase even more.