I recall you need to pay a fee when moving out of coinbase, not sure if that was still a thing since I never used coinbased when they had added a transaction fee. But basically you are doing a good job. Poloniex has one of the lowest fees right now to withdraw from the exchange, however, they might flag you though if you do not really trade and just use it for a wallet. Not to mention you are withdrawing and depositing from gambling sites. This could trigger AML policies.
Thank you for the response
I actually use GDAX, no $0 fees.
I agree with you about Poloniex though, which is why I sometimes buy a few bucks worth of other coins.
I know Coinbase (Gdax) is not gambling friendly. Can anyone say the same thing about Poloniex, which isn't nearly as regulated as Coinbase?
I'd say they are fine with it. I've occasionally sent money to and fro Poloniex without problems. However, since I actually trade a lot, I don't get flagged, I am not sure if that would be the case if you mostly use them as a wallet for gambling.
Good luck!