Let's put it this way - you are at 2.2 mh/s with your CPU and gobbling electricity. You could buy a USB miner (block erupter) from eBay for $12 and do 335 mh/s (equivalent to having 152 of your computers hashing away!) and use WAY WAY less electricity doing it. Your lottery ticket just got many many times multiplied!! Still about a 0% chance overall, but with just the electricity you will save for that lottery ticket - you will thank me!
Good luck!
If a computer is at idle, the power consumption is still quite high. Buying a block erupter and hashing it using your computer as the host can be expensive. If you use raspberry pi, it will cost $30+ but it depends on what you currently have. Either way, it isn't feasible.