If Tosaki's target is to have the average item on stock for about one year, he could model the fee such that instead of charging 2% of the sales price, he charges 1% of the initial price per item per year of listing and 1% at sales. This way somebody selling quickly or selling well above the initial price would save money and people that have their value weighted average item listed for more than one year selling at exactly the initial price would pay more. Setting the initial price at practically zero would reduce the fee to 1%, so maybe the equilibrium would be more on the 0.5% 1.5% side but it is all doable without charging more fees in total.
@SgtSpike: Optional listing fee with a way to sort by listing fee paid would be nice but I'm afraid it wouldn't work as people would get the reasoning behind the fee wrong as I wouldn't see that as a way to actually make these auctions more expensive. How do you sell that to the shoppers that the one auction pais .1Ƀ per year of listing + 1% of whatever you pay him and the other pays 2% of what you pay. Call them A and B? Red and Blue? Guess this option has a marketing problem.
Yeah, optional featured listing would be fine, but to make it clear again that I don't want the shop to pay extra to get featrued, here is an example:
Imagine a shop that has a listing of 1000 physical bitcoin wallets, selling 10 per day. He who has an interesting product would pay as in the example above 1% of initial (= final price) per month per listing + 1% per sale. Selling his 1000 physical wallets at 3Ƀ each within 100 days would result in 1%*3Ƀ*3months + 1%*3Ƀ*1000 = 30.09Ƀ as opposed to 2%*3Ƀ*1000 = 60Ƀ.
Actually no. My idea is to charge even when you cancel … in advance. You would configure the listing to be re-listed 2 months, so you would have to pay 1% for the listing now, 1% next month and get de-listed afterwards. It would be trivial for 1-item-listings to pay back 0.734 months if you sell early or to charge daily. The free listings for beginners (10? 100? per account) would still apply if this model is not optional.
(1%? 0.00001%? These numbers are completely made up the way it feels reasonable to me but please don't get excited about "overcharging" and "ripping off" people. It's just examples.)
I don't think it's a bad fee model to follow, but I still don't think now is the right time to introduce fees.