Overall I like Mercari. It is easy to list an item, and they only take a modest 10% commission or fee of the amount of the sale. But the thing I don't like is the potential buyers hitting the "Like" button. Now any Mercari seller or buyer know that when a seller gets a "like: about one of their listings, that is a cue from that buyer to "promote" or lower the price of that listing. I have played that game many times as a seller. I would see that someone "like" my item, and in order to entice them to buy it, I would lower the price a bit.
Lately that has not been the case. I would get a "LIke" and lower the price, only to see that the item still didn't sell. Now the price is lower than I wanted in the first place, and it starts all over again with another "buyer" liking the item and expecting you to lower the price again. So I would once again, lower the price, and the item would still not sell.
It is worse than running a garage sale, with everyone coming up to you with a item with a price tag on it and asking for money off.
But to make matters worse, Mercari won't let you lower the price to what you want, they tell you that you must lower the price between two different amounts, or no go, Now you can always just re-price it doing an item edit, but then Mercari doesn't promote it to all the buyers out there.
I am an E-Commerce seller and not someone who is just trying to clean out the basement. Maybe that's why I feel the way I do about MercarI. And if that's who you are, just trying to clean out your closet of unwanted items, maybe it doesn't matter to you. I think that sometimes there must be a bunch of teenagers hitting the like buttons just to make us all lower our prices, and then you never hear from them again.