This is more or less related to Prime, as I do not play on any other servers.
I have noticed that in web market the lowest price one can put on item is 5 where buyer pays 6, but some of the items are not worth that much bonuses.
So here is my suggestion,
why not make the lowest possible price to 2, meaning that buyer pays 2, seller gets 1.
5 seller gets -> 6 buyer pays
4 -> 5
3 -> 4
2 -> 3
1 -> 2