Like opensea? While it is a marketplace for NFTs, the fee is certainly a big concern but it seems that most of the networks for altcoins aren't that expensive at all. But a time when the demand gets higher especially in the ERC20, the fees are also going to increase together with the demand.
Whilst there are other networks that are being supported for each coin, you can consider that as well that your marketplace is open for different networks and wherever is the customer is confident without having interruption and problems with the fees.
Opensea is one among many marketplace for NFTs. I'm thinking a real marketplace where people meet to exchange good and services against cryptocurrency. Indeed fees would increase when demand increases.
But on low-fees blockchains, publishing a product would cost less than a dollar.
Furthermore, i think fees could actually be leveraged to protect the market against spamming and scams.
How user friendly do you think your platform be? -- not a rhetorical question, BTW
I think one of the biggest challenges of such marketplaces is onboarding users esp seeing what went down with openbazaar. Perhaps, you could think about hitting a middle ground between security and user friendliness? 🤔 (tho im not sure what that is ofc )
I actually misused the forum after my registration and here is my original post, where i talk about user friendliness
https://bitcointalk.org/index.php?topic=5494082.0