Back in 91 I got a Kyosho Stinger 4wd 1/10 scale gas buggy. OS-CZ .10 motor, Futaba 2 channel grip radio, bump starter w/12V battery....boxes of spare parts from 'oops' fun times. I'd drive it around til it broke, never took more than 1/4 gal of fuel to do it too. Actually threw the rod once as I landed a jump. Had over a grand into it back then....sold what I had left (most of it) for like $200 back in 01 or so.
I'd love to get into it again, but it isn't cheap. But the tech is nice. CV joints instead of 'dog bones'.....recoil and electric starters, 2 speed + transmissions, REAL disc brakes, etc. Plus the motors are out of the world. I had even gone with aluminum front shocks and adjustible rear shocks, revalved them and custom shock fluid, different tires, bearings in the whole thing, etc.
I'd like to get into some boats. But that too is $$$