Completely agree, around 20 should be fair, considering you are not selling an item but a villager. You can only have 10 and they will probably stay with you for a long time, so that price is reasonable.
I don?t think most of those people weren?t serious. It?s just that many threads stagnate and the seller stops replying. Many people post when they want a villager, wait for days and then "chancel" their order because no one replied. I have done that before too. If someone didnt even come online for a couple of days after my order, I made my own thread and bought the villager from someone who is actually "active", which i would recommend you do too if you still want those villagers. Many users here have the cards but don?t own a shop and sometimes browse the marketplace to sell a few villagers to those who requested. Not to mention that some players dont time freeze. So if they end up waiting for days and the seller never responds, another villager moves in and the space is gone, I have seen that.