a single s7 is doing $420 per month while consuming only $45 per month, with 0.05 in electricity, so even at 0.3(would be 6x45=$270 in consumption) you are still in, but the roi will take more time
this is thanks to the recent pump, so the diff does not really matter if you have a pump like this, that pump basically put us in a better position, than we were when the s7 was launched
It kinda depends on if they paid in BTC us USD. If they paid at BTC value 230 we had forever they chances are sick when looking at today's price and btc value.
If they paid in USD then they were not effected by that, and have had extra time mining at lower difficulties. Few fall in this category I do agree most fall in one you mentioned.