I don't understand this
Nobody has a issue to bargain with a car dealer or any other object they buy, but here one has to be caring?
Nobody is forcced into the business. Whoever sells knows the risks of doing business. Some will be left, some will be sold for cheap, people will bargain... You like the business do it, you don't sell something else
I am not saying you should squeeze every last penny of profit from him, but you can try to get the best price like in everything. Just be a mentch!