If someone has been looking for such an example for a while, and paying good money is the only way to secure it then thats the price.
Never under estimate some people's buying power.
Another day £750 might have been it. But the price you secured isn't wrong either for at least two people thought it was worth it to them. What price on your hobby? A lot of people didn't spend on their shooting this year so their boys toys war chest is groaning. Luck had it you had something they wanted...wanted quite bad.

I sold a sexier Venom for that price the other year. Ownership of either would be a pleasure. Of note there are a load of guns out there that just can't find a home for any price as they have no sex appeal. Venom brand is sexy.