Well, if it's not a first edition or signed, I fail to see why it would be worth any more than the retail price.
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Less than what you paid for it, as there are so many copies of this still around.
The only difference in the first edition prints of Harry Potter and the Philosopher's Stone to the ones that you can buy nowadays is the picture on the back. The original has Cornelius Fudge, whereas the ones now have Dumbledor.
Harry Potter and the Deathly Hallows is worth 42 Reading Counts points.
In Quidditch, the Golden Snitch is worth 150 points and wins the game.
His parents left him quite a lot of money when they died and he did not spend a lot, he also received money when Sirius died and he is the head of the auror department as well as his wife being a retired qudditch player so they are a wealthy family.