So with an investment of 7.6BTC you'll be able to generate 6.6BTC
and that's not even taking power consumption into account.
Why do you think i will never create more than 6.6 BTC? If i run the machine i will get very little amounts maybe , but it create amounts. And so after i reached 6.6 why do you think i will not create more? after one day of running i will have 6.60001 BTC maybe thats ok it increase
(maybe i have a naive thinking, i just wanna understand)
And After the difficulty is extremly rising i could change to an altcoin, right? I could mine peercoins and exchange it to bitcoin so its also increasing.
You're better off speculating with some Scrypt mining, buy some GPU's they will especially hold their resale value!
I was searching already for scrypt-mining chips but there are nothing or do you know some? I would really buy pci-scrypt-mining-cards not radeon r9 290 but i think thats future music ^^
Greetings
TRBC