as a buyer , i am always put off my folks stating how much an item cost on other sites especially when the prices are almost the same. My expectation is that the local marketplaces should be cheaper by default. Saving on taxes, and shipping was never an incentive for me to buy from FB/CL.
Having said that there is no right answer to your question. So you really want to sell ? do you have to sell? Is that extra $10 worth it to you ? what will you do with the extra $10 ? only you can answer these questions .. I personally wait for the market to catch up with my price , but don't take my advice , I am still sitting on 4 digit sets ( smh ) .