Bandwidth may be a problem then. I mean, your gains in mining would be seriously hurt by the bandwidth costs. Also, if more people start mining this way, there

Bandwidth may be a problem then. I mean, your gains in mining would be seriously hurt by the bandwidth costs. Also, if more people start mining this way, there will be more competition and your earnings will decline. There's also the case of some users maliciously feeding you false results. So you'll have to introduce redundancy to the system (I'm not sure if you get punished for false results apart from simply not getting paid though).