Some great info and comments so far. I pay $125 and the house takes 5%. This is the highest rent/commission around, but I decided to go with this mall over 2 others due to the fact that it is in between Providence and Boston and will attract more high end clientele and the fact that every time I have been in there on a weekend the place was mobbed. I have priced out other malls in the area and they are in the $75-100 range. The rent covers the entire case including the inside, top, and sides. This case is right by the entrance and registers so people almost HAVE to see my case. The way I looked at it I am usually spending $200-350 per month in Ebay fees. It's not apples to apples, and there will still be items I will need to sell on Ebay to maximize my profit, but in my mind I am already paying rent. Plus we all know that some items are hard to sell on ebay due to shipping costs. I didnt have to sign a lease, so I can pull out at any time if things arent working out.
As far as pricing and inventory, I have a lot of stuff that my parents left me as well as my wife's. I also have many thrift stores in my area that I have been pretty lucky at finding nicer vintage items for pennies on the dollar. I also have established relationships where I have been able to buy jewelry slightly over melt and coins at a very good price so I have plenty of items and decent room for profit.
The final thing working my favor is my competition. All the coin vendors are ridiculously overpriced. Common morgans for $35, a roll of 40's/50's wheats for $8, 1 oz bar of silver for $45; people see these prices and come to my case. I am at $24-28 on Morgans, $6 for 100 wheat cents, and all my higher priced coins are right at what they selling for on Ebay (I use ebay sold transactions to price my coins, not a publication).
Plus all of this is fun. I love finding bargains, I like the thrill of making a sale, and my wife and I both love going to thrift stores. Its win win!!!