Qanda wrote:
Erm, I would think that a person who earns a lot from his shop gets the items through restocks. Its hard to make a profit by buying from other neopian's shops and selling them for a higher price in yours.

I beg to differ. I don't mean to brag, but I make a ton of nps by reselling. Buying things from people's shops and then reselling those things at the market price. Ask anyone who knows how to do it well and they will agree. In fact, check out gooberticket's userlookup sometime. He has a mega-sized shop and his motto is "Buy low . . .sell reasonable."
Every one of the 605 plushies in my plushie gallery was bought with nps earned from reselling--so, I think I am pretty good at it. You just have to know what to look for, have a decent amount of capital, fast fingers, the ability to be patient, and like the shop wiz.
EDIT: And, what I have seen in many reseller's shops (though I would never, ever do so myself), is that they will have one type of negg or map piece so that it is the lowest price on the wiz and price the rest at absurdly high prices. With the hopes that the people who come into their shop will buy one of those high priced items as well.
Scenario: The naive or new player sees the one map piece as the cheapest on the wiz, goes to the shop to buy it, looks at all of the other map pieces in the shop, says "Gee, this person has all of them. I will buy the rest here," and pays triple price for the rest of those map pieces.
Tested made this fabulous set for me!!! Isn't it great?