A lot of the vendors we buy from, buy local auctioned units. Most the time, stuff stays there only a week or two before a new load is brought in. No, they don't sell everything.
Then there's people that bring in their finds. While they sell a thing or two each time, not a whole lot of it moves fast. It's the same stuff week after week. There's one lady with the same stuff. I've asked her for over a year now to come down on the price of a remote. Now I ask her for kicks and giggles. Seriously, is it worth it to haul the same stuff week after week for a year?
You can either rent a large space and haul it all for a few weekends. Or rent a smaller space, and rotate the stuff each weekend. Maybe taking a few more weeks to sell it. Then you can rotate the old and new together. Till it's gone.
Then try a different flea market. While most will go from one to the next. There's at least one going on 6 days a week in California. But some only go to the one closest to them. So there's some old and new faces at the next flea market. Same with the vendors, some go to all of them, some only go to one.
While tables are a must at a yard sale, flea markets are different. I guess it depends on your area too, but it's more exciting to see if there's a hidden treause in row and after row on the ground. Rather than set up like a store display.
Obviously breakables should be on tables, and higher prices items. Books and movies should be placed at eye level for easy reading of the title. Whether it's on the table or dvd stand/book shelf.
It's hard manevouring around tables with other customers. With rows on the ground, it's easy to step over to go around them. Just don't leave stuff buried too deep, like in big storage bins. Thin it out a little.
BTW, it's not ebay, don't ask ebay prices. If you want ebay prices, sell it there. I had a lady tell me she wanted above retail price for a KitchenAid mixer. It was one of the smaller models, and totally not worth it. But she always thinks she can get above retail prices on name brand stuff. Even when it's still sold in stores new.
It's fun, it's a social, eating, gathering kind of place at the flea market. Don't be afraid to take your stuff to other vendors. Like video games, or electronics to some one who only sells that stuff. Again they sit on the same stuff week and week.
And don't be like my grandmother, letting people nickle and dime you, and sell everything for a quarter.