Sorry @bonsaitreehouse, i didn't mean to be rude... Or if i was and i apologise for that. But i really think you wont get your 300% return. Mining the big players (btc, eth) is becoming harder and harder with the increase of difficulty, so with the same hashing power, your income is going to decrease, and with the PoS ethereum mining is going to be dead soon. Mining smaller coins may be interested though as they may have a rise in their price, but it is a bet on the future, and you have to pick the good one. (I didn't chack what alt-coins you could mine with genesis rentals...)
I really think it's more profitable to invest directly in cryptos rather than mining. Yesterday i bought some litecoins when i knew they got on Bitstamp at 34.6 and they are nearly at 40 already. But hey, maybe you're going to prove me wrong ;) I hope so !

Lot of people have good material in their PC and it just sits there doing nothing. Lot of Gamers have excellent graphic cards that could generate money and they don't. That was my intend. To get the most of what you ALREADY have and do not exploit. 108€ for renting 100Gigs for a year (it's about 120$) is not bad i think considering that it is space you do not use and costs you nothing (i've recycled a 1To hard drive that was doing nothing just for that on an old computer)... And with a core i7 processor alone (that lot of people have!) you can generate 0,36 € to 0,45€ a day depending of the model. You already have it, you don't exploit it's computation power.

You're right on cost to exchange the storj coin and the fees to exchange money from accounts. true. But i believe in the storj project, and i really think that it's going up (it already went from 0.15 to 1.5$)... But true it's a bet.

I'm going to follow you and i really hope you'll prove me wrong ;)

Have a very nice day @bonsaitreehouse !