I would prefer you to buy a server. I ran 80 green dragon bots over month and made over 400m, then i decided to sell all bot accounts and got 1400 dollars, bought osrs gold and started playing legitly with 800M, its not bad. Servers are pretty easy to sell after use. Lots of people do it and in china they gold farm with 5 servers and run over 400 bots in rs3/osrs. I wouldnt buy a computer for multiple account botting