re: Restaurants charging for a refill or cup of sauce

If the amount provided is reasonable and the cost for extra is essentially at restaurant cost - that's fine.

If they are trying to turn basic meal elements into profit centers - it's obnoxious.

If you are going to doing EVERYTHING at a fee, you have to make sure you aren't charging full normal price for the fries and then 50 cent for each 10 cent packet of ketchup (as an overstated example). If its no drink refills, price the first a little lower than the bottomless rates that are normal.