I don't think an auction house will be interested in selling stamps with CV of $50 individualy. They most likely would want to group them into lots and then they probably wouldn't even show a picture. Stamps of say CV $200 in VF condition may be worth their time to sell singley.
You also don't mention if higher value stamps in the $14000 are certified. That would be a must for auction houses.
You way want to consider selling somewhere like
ebay. Much better market for single stamps and small lots.