What would you do in this circumstance?

I'm using a Late 2013 MacBook Pro 15" retina 512GB SSD 16GB ram NVIDIA GeForce GT 750M Intel Core i7 2.6 GHz.

Several keys no longer function. I've tried popping them out and cleaning but there is no result.

Basically, i'm asking the community to advise me on the best course of action.

Does the repair cost basically render the computer totaled? Maybe i can sell it and use the money to buy a used MacBook or something. Given the specs i provided and the faulty keys, how much money can i expect to get out of this and where would i sell it?

If you have any relevant info feel free to contribute.

Nick