Well ... with luck in choosing when to buy them (low $ to BTC) and luck selling the BTC (high $ to BTC) you could say it is possible to make a profit ... extremely unlikely, but some small tiny % of those who bought them could do that, however any such profit is guaranteed to be less than if you simply bought BTC ... since you had to hand the BTC over to AM up front only to get less total BTC back (if you mined PPS or similar)

I'm still yet to understand how people see a positive in that ... most likely it's their way of dealing with making a bad choice or being ripped off ... denial