Given Pinniped's info on upgrades (none on revenue stays), a low-category 1-or 2-night stay is the best use of the points. But if BingoLoco really is not interested, s/he should offer to put the points into someone else's acct. on our own Coupon Connection, a restricted FT forum to which s/he will gain access in Nov. (90 days after joining.)

Offer to transfer the 13K into another FTer's Marriott acct. in exchange for 6--7K DL miles into Bingo's acct., perhaps via MyCokeRewards.