Why wouldn't you cash out on what you're doing and possibly buy more pcs/equiptment? I'm an IT guy for a local church/school and they have around 97 stations on campus. I brought up the idea of using the pcs to mine after everyone goes home. I have a script set up to log on to an account. A startup script runs the miner and gets around .7Btc a night. Once we get enough, we're cashing out to get couple gigabit switches.