Excuse me while I go toss out my paprika
They need to stop providing liquids at all. You get a bar of soap. If you want something more, then there should be a for sale kit on the room service menu and refills available at the main store. You could pick and choose what you want in your kit, like 2 items for one price, 3 for another, buy 5 and get one free. You could even then choose the products - H2O or Elemis, for example. Concierge should get theirs free, but still have to "order" it from their host.
People would be angry that they have to pay for what used to be free, but they wouldn't be stealing and they'd likely take home what they wanted, not what they're trying to sell on eBay or give as gifts to whomever at home.
If you don't want to buy... bring your own.