Everyone has to have something to entertain them, and keep them occupied, and people who collect things are often misunderstood in their quest for hobbies. It does not matter what it is that they collect, it is the fact that they are keeping them safe for posterity. Those are the people who collect things like toys and cars. Some of them actually make money with this effort, unlike people who collect twist ties in a kitchen drawer.
All of those bones archaeologists keep finding in caves must be where it started, meaning collectors have been around since then. Those bones must have been the start of a collection, even if they were used as tools. And the personal items that are discovered in burial grounds of early humans. Surely they could be considered a type of collecting.
Somewhere along the way, mankind got another bright idea for things to collect, and started collecting coins. For a miser this is an honorable hobby, since the coins never leave the coffers. Then consider that given enough time, everything is worth a lot more than was originally paid for it. Of course, it is a good idea to collect things.
Some people collect model cars, even the ones they put together themselves. These models have been around since cars were invented, and should make them worth being collected. Just about anything invented becomes a model to construct. Besides, it would be difficult to keep full sized cars in the recreation room of most home.
Speaking of which, full sized cars are nice collectibles, too. Every type of car that has been made is being collected and stored in various museums across the world. Now future generations can see what transportation was like before the personal jet pack. This is probably a really good idea to collect cars.
Another type of vehicle that is made of metal, and makes a great collectors item are the die cast cars. These appeal to the collector senses, like the bigger size that is suitable for being a good outdoor toy where there is plenty of sand or dirt to play imaginary grownup, to the miniatures that look so cute on the shelf.
That brings something else to mind that is a good collectible. There used to be a toy set that came with a car, sometimes a wrecker, and a service station. Oil crisis were the end of full service gasoline stations, but somehow it seems like a good idea that such a memory be retained by a collection. Gone are the days of a station attendant filling up you car and checking the oil, water and airing up the tires.
Hobbies have been around for a long time, and collecting has been around just about as long. Toys, keepsakes, any other item that ever existed is a possible collectors item. Collecting is therapeutic. It can calm a person down by allowing them time to get away from the issues of their full sized world. Let the collectors have their fun and enjoyment of keeping the future informed of what the past actually did.