Obviously the number of amenities hosts can provide is basically governed by the nightly fees.
But what is provided should be of decent quality and enough for the number of guests and length of stay. A one cup coffee maker in a listing for 4 people is ridiculous. Expecting guests to go out and buy their own toilet paper because the host only left 2 rolls for a 3 night stay for 6 people is ridiculous. If a host is going to provide coffee, it should be good quality, not the cheapest coffee on the grocery store shelf.
I have an inexpensive homeshare listing for one guest. I provide basics in the bathroom- soap and toilet paper is all I advertise. Of course towels, and every guest gets 2 good quality bath towels, a hand towel and a washcloth. But there is also a basket of “help yourself” items left behind by other guests and which I also add to, where there is usually some shampoo and conditioner, sunscreen, bug spray, ibuprophen, menstrual pads, etc. And I keep a jar I replenish full of Q-tips, cotton balls, tooth flossers and bandaids. These things cost me very little and guests do use them. I don’t provide a hair dryer- I’ve never used one myself and am not going to spend the money to buy one, plus they are heavy consumers of electricity. Also live in a warm climate- guests aren’t having to go out in the cold with wet hair.
Guests comment positively on how comfortable the bed is. I don’t cheap out on decent cotton sheets, or nice pillows.
Guests share my kitchen, are welcome to use my oil and spices, and I provide good quality coffee, cream, sugar, and a 4 cup french press, as well as various kinds of tea.
As my guests know they are getting a great deal on the nightly fee, I’ve never had a guest in the 10 years I’ve been hosting complain about what I provide, or that it wasn’t enough. In fact, I’ve had guests tell me I could charge more.
If a host is going to list amenities that don’t function properly, or are of poor quality, they’d be better off not listing those amenities at all.