this is a big problem, at the end the money maked with the first purchase, are needed for the next one and so on, in this way you will never make any profit(ora at very least a tiny one...)
A problem for who? It's just a market like any other; there will be winners and losers; right now the mining equipment manufacturers are big winners in terms of ROI and miners for the most part will be losers.
It is natural and normal that profit margins get squeezed to near zero over time and those who are unable to maintain a profit margin will be squeezed out of the market as they should be. Mining speculators should be knowledgeable about these risks and should be willing and able to accept them. If not, they should stay out of the market.
