Just today I was going through tons of sockets, mind you nothing in sets just tons of singles and trust me they were not cheap, being snap on,mac, and Matco. So, I can see the guy wanting what he is asking. In a funny twist, I was picking up proto, p&c, boney, and SK for around a dollar or two for larger sockets. Quality drives his asking price. It cost me with tax $83.00 dollars for 41 sockets and 6 taps or something like $2.02 per socket which I feel I got my money's worth to help me try and fill some missing spots in my collection.
If I had paid his snap-on price, I would not have that 41 sockets, more like maybe 15 sockets if that. So, you have to ask yourself if you want a lot for your funds, or a nice quality complete sets, either way if you are happy then go for it.