You lost. That's it. It hurts, cry it out, and get over it.
Gamble for fun, work for money.
You seem to think that Primedice made 1.68 Bitcoin profit when you lost 1.68 Bitcoin to them. That's not how this works! Primedice on average only earns 1% of what you wager, so for them to earn 1.68 Bitcoin, you'd have to wager 168 Bitcoin.
Compare it to an insurance company: if you pay 100 USD on car insurance without claiming any damage, that doesn't mean the insurance company has earned 100 USD profit. Someone else did claim damage, and they used your 100 USD to cover it. Casinos are the same.
Playing with 1.68 Bitcoin makes it very likely to "easily" earn a small profit. It also makes it easy to forget the risks.