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I have been a store owner for over a year now, did some good things and boy did i make some stupid mistakes too 
Pffff…. over a year… I am getting old!!! Maybe by telling you about the stupid ones, you can skip the stupid mistake phase!
What first comes to mind is settings. I create sofa’s and chair’s with animated poseballs (see my furniture store for some examples). I bought full permission animations for a lot of money and put them in the poseballs. Now, when you put animations in poseballs, the settings will be the same as you have them in your inventory. Back then i sold furniture modifiable, i changed that later on for more reasons, I’ll write about that subject some other time.
I thought since i had put the sofa’s and chair’s to no copy, no one could copy my animations. NO!!! Since i didn’t change the permissions of the animations in the poseballs, they remained to be full permissions and the next owner could copy the animations. After a friend told me he tried to get animations from modifiable things i saw the light So always set your animations in the right permissions.
More tips will follow soon.