No, and increase in demand raises the price.
P.S. In case it wasn't clear to you, Apple devices cost the same from anywhere. That makes them a good example here.
Here's $329 for a mini at Apple.com: http://store.apple.com/us/buy/home/shop_ipad/family/ipad_min...
And here's the same price at Walmart.com: http://store.apple.com/us/buy/home/shop_ipad/family/ipad_min...
Walmart makes a profit because they bought the mini at a wholesale price from an Apple distributor.
(#) Which is obviously a risk - who knows if you find buyers for all of the 100 thingumajigs you had bought wholesale. And taking this risk is a part of the value provided by the reseller.
Why might someone pay you more? It is as simple as presenting the product in a better way; in a way which gives the buyer more confidence or otherwise makes them more likely to buy.