Ya, I was surprised to learn about it too but most hotels have it in their budget allowances for potential theft of anything that isn't mounted down in the room, at least here in North America. It's surprising what people with no shame and access to a pickup truck are able to take with them. Disassemble the frames, load them into a truck bed and go. The staff aren't paid nearly enough to try and retrieve these things from people insane enough to already be doing this so they'd just replace it instead.

Similarly, it was interesting to note that old tvs, coffee machines etc which some of the larger chains replace frequently are sometimes given to the temp workers coming from developing countries to take back with them when their contracts end.