Some become offended that this shop owner offered such a seemingly low price! It's the gun lover inside all of us. We can't help it...

But as was stated this shop owner has bills to pay...
Mortgage or rent, utilities, payroll, etc...
Also cash flow is king in business and no small business especially can allow their cash to be tied up into inventory for extended periods. Hence the seemingly low offer (Which I believe is around the norm of 50 to 60%)

Most of us on the forum pretty much know a gun store isn't the place to sell your guns. But we probably don't mind when a widow decides to offload her spouses guns and then we get a chance to score.