We have enjoyed several very good meals at Altro at $29.00 and they did add in the service charge.
Funny to mention it but it is one of the few restaurants on the island where the servers actually hustled to give good service.
Even at current price it's a bargain considering the quality of the food.
After all the fancy restaurants, we find Altro casual and a close drive to Maho.

Driftwood may add a service charge because of the daily ship travelers who may not tip well.
We have always had good service at Driftwood and the bartender makes some very good mixed drinks.
No problem with them adding the service charge.