After reading this piece of news about BG marks changes, i became interested of their worth atm.
The only way to convert marks to honor right now is Concerted Efforts. We bring 6 marks, and receiving 1489 honor points.
It's 1489 \ 6 = 246 honor per mark.
And after 3.3.3 hits live - each mark equals Commendation of Service, which gives us 185 honor points.
So, my point is, get rid of your marks until 3.3.3 goes live via Concerted Efforts.