LTC got alot more difficult. On a 7950 I can get 620kh and I expect some expert could get nearer to 700.
Problem is you are always going to get squeezed by those who will operate a machine anyway or the Alaska type scenario. some are on solar power I guess, always something. My machine is on graphing stock quotes most days in any case
Thats a natural market, it tends towards competition and squeezing out the best efficiency
But this is all up to the speculators who play the market.
Speculators do not determine a market, they are most active in transition but its buyer and sellers who determine the start and end