Hot Wheels: Little cars are big business
ft.com
ft.com
No other toy even comes close to that level of value.
And no annoying tv shows, characters, etc etc etc.
Mundane cars, municipal service vehicles, construction vehicles, just about everything. All of it in three scales, I think.
I tell my wife that Matchbox are the "proper cars" and Hotwheels are the whacky lumo-plastic monstrosities.
My favourite is a Johnny Lightning Jeep Wagoneer. We didn't get that brand of toy in Oz when I was a kid, they are insanely detailed compared to a Matchbox, Majorette or Hot Wheels. I am tempted to buy more of those.