None of that applies to a 5 year mining contract, since they are under contract to continue to provide the hashing power for 5 years whether it is economical to do so or not. This is simply basic math, the total proceeds from hashing for the entire 5 year contract come to be less than what it costs to purchase.
I don't think that's correct. The current cost of a gh on PBMining is 0.0056.
https://tradeblock.com/mining/a/702307c1fbIt's profit by August forward. Assuming current BTC price remains constant. This is better than holding.
(Assuming not a ponzi for the purpose of this discussion only.)
I've already explained the apex where mining is worth more than holding, but you need a value around $4,000 for that to work out. Which isn't likely.
Nevermind, I think I see why people buy these things, they don't get basic math. According to the calculator YOU linked to, 1gh/s purchased at 0.0056btc will never return 0.0056btc. Ever. I do see where you made your mistake, if you run the calculator starting in April it will eventually return more than 0.0056btc. But of course April is already over. Starting now, since pgmining doesn't seem to offer a time machine on their website, you can expect to get around 0.004 btc back by August.
Regarding your second point, you keep saying that if the price of btc goes up it makes this a profitable move. It doesn't. Obviously the dollar value of the btc you get back would go up in value, but then so does the dollar value of the cost you paid. One last time, paying 0.0056btc now to get 0.004btc later is not a good deal! And makes no difference what the btc is worth in dollars. But Im a very generous person. If you think it is such a good deal, I promise to give you 0.004btc in august for every 0.0056btc you give me now. Any reputable escrow service you wish to use.