Cash that i save up by being frugal and not having expensive tastes, or hobbies. There is practically no market for used pc parts where i live, so i give away my old stuff for free.
To those that made up their gpu cost by cryptocurrency mining, how many gpu's did you need initially for mining? I would think that one would need (even when cc was starting out) a farm of gpu's to get any kind of income from mining.
Depends on when you started. I started in late 2013 on Litecoin on a 7950, which 100% paid for a r9 290 shortly after release for $400. If you got in on the early bitcoin days a single card could make you thousands of dollars of bitcoins at today's BTC prices. I made a modest ~$600 total off of Litecoin between 1 7950, and 2 290's and that was the biggest my "farm" ever got. That's revenue not including the cost of electricity at the time.