I hope your joking. If your not, then you have no idea how to gather and analyze data to come to a conclusion, I thought you would know how to do that. Because mining is basically like rolling dice, you need more than a few blocks worth of income to conclude anything.
I saw them as a worthwhile investment for the lifetime contracts, it seemed like they drop the fee for everyone the last time they reduced it, to me its worth investing in mining with a company that is actively managing their hardware and reducing costs where they can. Since I had a few years to figure things out, I have figured out how/when to invest in mining so as to maximize profits, the only clue I will give is the quote from Warrent Buffett that I have been known to throw around :).