I think it's great that you have increased your contributions to GRC this way, but based on the arguments above, doesn't it still make sense to turn your rig off and buy GRC manually until the prive is 4-5 times higher? (I am just playing devil's advocate here, I would probably keep mining myself if I had a reasonably strong system! It is this feeling of "contributing directly" that I find very interesting and would like to understand better.)