A $10 USB stick for mining will easily beat 2 or more fast gaming PCs with very expensive graphics cards. Those USB sticks are at this point useless, but that gives you an impression of just how useless a PC is for mining. You could get one of those if you want to try mining very cheaply. Keep in mind that you never earn an amount large enough to actually cash it out from the pool and that the website won't be able to show a live hashrate for your mining because your hashrate is so slow that it is essentially zero.