LOL!
By last accounting, 13. Six drifters, six "M" class, two crawlers and one rock racer. Some have dual purposes, so that's why the numbers don't add up. I have no 1/10th on-road "grip" cars, which is why I got the H4e.
I separate them like this - spring and summer, I'm either crawling/rock bashing, or driving the tires off my "M" class. Fall and winter I drift, so they all get driven, just not all at once.