FM.co and FR.co – Virtual TLD or Flip

I need some advice.

I have owned 2 great 2Letters.co domains for a couple of years now:

FR.CO
FM.CO

I periodically get low /mid-5-digit US offers for them from qualified buyers.
To date, I never sold it. One reason for not selling them is because I am intrigued by the possibility of seeing these short domains turned into TLDs. The FR.CO is particularly an obvious one. #dotfr

FM.co and FR.co – Virtual TLD or Flip