I am not, nor ever want to be a "car collector". It's like work. Work isn't fun. I have a bunch of cars. They followed me home or ended up where I bought them because I liked them. And unless I'm wanting to buy something else, I never advertise them for sale. Because I don't buy them with any interest in ever selling them going in. I know how much insurance and repairs, and parts and upkeep cost even with me doing the work.
Can you make a profit flipping cars? Sure. I think my brother is an idiot. But he's a gifted salesman. He used to drive trucks and would spy cars sitting in people's yard, and come back later and offer them $500 for that Alero or Grand Am with a bad head gasket, otherwise in great shape. Most of the time, he'd get the owner to basically dump the car on him by just signing the back of the title, he would hire a mechanic to replace the head gasket for a few hundred, get it running right, and sit it out front in his yard for $1500. Bam, in a week, he made 500 bones profit and hands over a title with the owner's name on it. Which looks like he technically never owned the vehicle. Legal? I dunno. Didn't want to ask. There's been times he's sold 8 or 10 cars in a month from his driveway. He averaged around 3 or 4 cars per month. Don't know his exact profits, but he was getting "free" washer and dryer upgrades in no time, as well as buying a newer truck that others paid for. No overhead other than repair costs, and he usually farmed that out to a retired mechanic he knew. He was also friends with a paint/body guy who did work on the side. So if a car needed a touch up...no problem. People wanting to buy their kids their first car were the ones that would buy them from him for the most part. Keeping it on the cheap kept inventory rolling and cash flowing. He eventually opened his own little corner car lot and made quite a haul selling what I considered "high school A to B cars". More work than I'd want to do, but for him, it was fun. He likes to do crap like that. I don't have the patience with people in general.