I own a shop on Amethera, I bought it in auction for 3000ped but will probably get 6-10,000 ped if I sold it now. So I've already made money. I also bought a shopkeeper to increase the amount of items I can sell and again this was purchased for 700ped, now commanding 4000ped. Wish I'd bought more of them at the time.
I get pleanty of passing trade as well as regular customers and I trade only my own finds from minning and hunting.
I've had about 15 sales in one day and my average takings is about 1000ped per week. Now thats not all profit of course.
I view my shop as a 24 hour presence in-game, it allows me to get on with minning and hunting or whatever I'm doing that day, and also allows me to obtain a higher markup than I would normally get if I were to trade at PA, so more profit margin. AND you dont get bored...
What next....
Firstly...I'm not making ped from my shop, rather I sell my own stuff for a slightly higher profit which keeps me going in-game. In fact I've not needed to deposit for about 7 months, but I would like to get to a stage where I can save up some ped to fund further purchases of at least another shop, land and equipment.
I think the only way to make real profit from your shop is by trading, and thats what my next step is going to be but I've not finalised what. I get a large turnover from my finds but not all are high profit margins, or do I specialise in rare items for higher profits...I dont know yet.