I was wondering too about the listing prices on known exchanges but there is no open information on exchange sites. Fees depend on the project's itself in my opinion.
Most of the exchanges like Latoken, which costs if I remember correctly 2btc and similar ones have stable prices.
However, I believe if the token shows good liquidity and many trades, they can give you some discount.
In general, this is all self-tuning, this is not normal, the exchange receives from the virgins for the listing, from the users for the trade, and in the case of hacking it does not respond with anything. A normal exchange with good service and non-horse commissions will appear sufficiently and everyone will gradually go there.