Crazy I would say, I personally would value them at around £350 each and maybe a bit more for the big fellow, I would have thought £5,000 not £50.000 was the top end of their value.
However something is worth what someone is prepared to pay for it, and if he gets someone thats prepared to pay silly money, good luck to him.
He does mention contacting him about individual stags, I think this may be a fishing expedition to find out what value Joe public will put on them.
Novice, yes there is a market in Europe for trophies, some gamedealers will buy decent heads of you, as they are no prep .
Go to any game fair, I have seen Roe heads for sale [cleaned] £15 -£30 these are small heads often youngsters
while I sometimes have to prepare heads of this quality for clients, I personally would dispose of them hardly worth putting the boiler on for, but they seem to be able to sell them.
Look at what they ask for a small bit of antler for stick making, or the latest thing dog chews.
Whether the Europeans that buy them just want a collection of heads , or whether they try to pass them off as there own, I am not sure.