Sorry, I didn't really explain my position well. The idea behind it is that buying in for 50BB should be exactly as profitable as buying in full for 100BB at half the stakes, minus maybe .5bb/100 for higher blinds. Thus, in bb/100, your winrate should be half as high at the 100s than the 50s because at the 100s the BB is twice as big, for the same buyin.

If your winrate is the same at both levels, you are running hot as [censored].