You may like the feel of the carpet, but if you are getting a negative reaction it may be worth the small expense and inconvenience to take out the carpet and have those floor polished and ready to go.
Do you want to sell? Tear out the carpet and finish the floors. Time is money. The speedier you sell, the more value the current asking price has.
No, you cannot increase the price for doing this. A house will only pass appraisal if it is comparative to recent sales (90 days) within the same school district and zip code and preferably, intimate neighborhood.
Do the floors and sell the house and get on with your life.