could you tell us why? the truth is solo mining is a very high risk very high yield investment
If you have 15 cent power or better and the gear burns .8gh a watt or less.
Gambling is putting in money at unfavorable odds.
Investing is putting money at favorable odds.
If I offer 1200 to one on a 3 digit number and you take me up on it you are investing in a very high risk high yield investment.
If I offer 990 to one on a 3 digit number and you take me up on it you are gambling.
The true odds are 1 /1000.
So if I go to nicehash and buy 500th for .012 a th and spend 6btc I am investing.
If I go to nicehash and buy 500th for .016 a th I am gambling.
first case the math is in my favor.
second case the math is against me.
Back to the OP this is all simple game theory. No more no less.