Its a hobby, pay the price thats worth it to you.

Dealers? Well frankly there isn't enough in old guns as it is. Not alone. The old guns are only taken in to get customers into the shop to buy other more commercially viable stuff.
(Making £50 on a gun isn't a profit. I think the take would need to be at least £150 to make commercial sense from a retail outlet.)

Hobby dealers are at best hoping to cover their costs and more likely to make a small loss that their enjoyment of te hobby pays back.
Without some other form of income then it doesn't make commercial sense.
For those who do it its for the fun of it all. I'm pleased someone does do it as its fun for me too, if only to look at some lovelies. So thank you.

There will always be chancers or those who just don't know but give it a go at selling something well above the odds. For buyers its your money, and how you spend it is up to you.