I am not sure I understand what your question is. Is it more difficult to sell although the termites have been removed? More difficult than what?
I am sorry you did not get a termite inspection on the house you bought, it's a $50 insurance policy to get an inspection, I wonder if you bought the house with the help of a real estate agent? They should have gotten an inspection and in that case the seller would have to have made the repairs or pay for the treatment.
Selling the house with a termite contract is a good thing and a buyer will do an inspection and find nothing, so you are doing the right thing. Speak to your agent about the property disclosure required by law to be given to the buyers.