Thanks for the calculation- yes its a very low chance but I'm using power that would otherwise be wasted so my power cost is effectively zero :) and its also about being part of the peaceful revolution. Setting up the miner I learned a bit more about the pools and the process so I guess for a hobbyist its quite rewarding. Long live the peaceful revolution that everyone can be part of to provide an alternative to the fiat debt slavery bankers cartel that owns most governments and hopefully we achieve The Bitcoin Standard before another 12,000 years!