Is there any rule against using the Faucet to exclusively increase the waged amount of the account?
As long as you're using only one account, you're fine. Faucet abuse would be: claim faucet, max bet on high multiplier, withdraw, repeat.
But you wouldn't be able to continue after you withdraw, right? And I was wondering if the following scenario is considered abuse:
Faucet claim: 4800 Satoshis
Dice bet: 100 Satoshis on x75 multiplier
Buy lottery tickets with profit
That's how I've personally been using the faucet, but I also deposit fairly often as you can see in my account history
That's not considered as farming, you're safe