Hotel staffers, with a few exceptions generally get paid and don't provide me the same level of service that a good DM does. I tip the maid in most hotels $5/day. I tip waiters and bartenders 20%. All of that is adjusted if the service isn't great of course.$10/tank? that's near a 30% tip.. you don't tip that amount neither in a 5* superior hotel.. lol... and above.
If you can't or won't tip then don't. It's not a requirement.