I collect 1/64 hot-wheels cars, but only real ones. None of that "Way-2-Fast" garbage. I try to get 'em in plain colors - I don't like the corny decals and vinyls. Right now I have 288 of them in wall display cases. Every time I transport them to another home (I've moved three times in the last year), I analyze them for chipped paint. If I so much as spot one tiny flaw, I remove them from my collection. I've spent about $1,000 on these cars so far. Some of them cost $100+, like the Veyron and Murcielago SV.
When I was younger, I had probably 700+ hot-wheels cars, that I played with all the time. Now that I'm older, I just like to make them look pretty on the wall. I also bought a sixteen-foot, six-lane downhill drag track for them. Aside from my 288 on the wall (in two 144 capacity cases), I have about 50 "racers". They're duplicates of ones I have in the cases, but these ones have the decals and racing vinyls. These are the cars that I send down the track. I have a few friends that have a solid hot-wheels collection as well (blame me for getting them hooked). We sometimes race our cars together, to see who has the fastest one.
Ironically the fastest car so far is a 1969 Firebird.