Great Britain: a man has discovered an Anglo-Saxon treasure, a big sum of money for him. Right or wrong?

A 55 years old man, whose main hobby is searching treasures by using metal-detectors, has found in Middle-England the most important Anglo-Saxon Treasure, remained unearthed for 1400 years.

In the article by Raphael G. Satter on NBCNEWS.COM, you can find deeper informations about:
http://www.msnbc.msn.com/id/33004687/ns/technology_and_science-science/t/largest-hoard-anglo-saxon-treasure-found/#.UA3Q_2F14dE 
or in italian:

http://www.schliemann-carter.it/News%20archeologiche.html

According to English Law, Treasures belong to the person who find them, for this reason the Birmingham Museum, the Pottery Museum and the Art Gallery are thinking to buy the objects from the man, giving him a very big sum of money which could change his life.

Now, the question is…is it right? Shouldn’t these Treasures be Government Properties?

Could this system incentivize the activities of swindlers, Treasure Hunter, or...

 ...graverobbers?

What do you think about it?