My understanding is you are always outspending on energy costs because of the energy inefficiency of personal computers for mining vs. a dedicated machine. So the chance of return would be more or less 0%. More like, "If I pay $5 for a lottery ticket where the max I can win is $4, what are my chances of profiting?"
But again, not an expert. Just the articles I've read and people I know who mine bitcoin say you can't profit that way.
But again, not an expert. Just the articles I've read and people I know who mine bitcoin say you can't profit that way.