How come Dollar Tree items cost more on Ebay?

I bought an iPhone 5 case from Dollar Tree for $1.50 and found the same exact one on Ebay for $2.99. Why is this? Are items from Dollar Tree worth more money? Or are these sellers on Ebay crooks?

They probably have to pay a listing fee and might factor in some additional costs that aren't present for simple brick-and-mortar retail.

Really depends on how much the buyer had to pay for the items, as you sell to make money. Dollar tree buys bulk, therefore they get a better price, so they can sell cheaper! Hope this makes sense.