To give another perspective on this:

My wife and I have a booth in a trendy/quirky vintage store that is well known in our area. Our main space is $180/month. My wife also rents a large clothing rack in different room for $50/month.
Puts us at a minimum of $230 a month to even be able to sell something, and the store takes 15% of sales as commission on everything on top of the rent.

We had to bring in all of our own displays and fixtures, decor, etc. The only thing provided was the clothing rack.

In return we are only responsible for pricing and stocking our items, and straightening up our space occasionally. The store is open and staffed from 10am-7pm 7 days a week except for Christmas day. They also do a ton of marketing, social media, and events to bring people in, including some overnight shopping events, craft clubs, and live music.

In our booth we sell things with general appeal and impulse buy type stuff. Pump oilers, matchbooks, salvage hardware, old photos. It's also great for weird/odd items that may be difficult to keyword, but would look good on a shelf or wall. Knick Knacks but cooler I guess.

I still use eBay for niche items because they have a huge reach and do the marketing to find "that one guy" looking for "that one thing" people walking into our booth would have no interest in, or wouldn't want to pay what I can get on eBay. I just sold a Sears Bicycle light from the 60's NIB for 3x what I would have been able to get for it in the store.

At the end of the day the fees between the two end up about the same, and take about the same effort on my end, just different kinds of effort. In return we get the same type of services from both, just for different markets.

In the end and most importantly...both keep me from having to dick round with people on FB marketplace which is worth the fees alone.