My thinking is if you don't have any interest in keeping the game for the long haul (and by that I mean something like 10 years) then let it go now. You'll need to sell it to someone that wants a Sharpshooter and is willing to put massive time and money into it(because that's the game they always wanted) because if you try and do it and then go to sell it right after without long term enjoyment of the game then you will be so upside down on the expenses you will never recoup.
John