I spent a few marks before they where announced and lost out from getting the BOFF by 30k or so dilithium and Cryptic was sitting there telling everyone that had done the same thing as me that they lost out of the BOFF compensation.
They announced that there would be a marks to dilithium conversion and then several weeks later (after the majority had spent their marks) they announced the BOFF and few days later the conversion happened so it was impossible to farm enough marks to get it.
Didn't play STO for several months after that and I'm still pissed about it.
I remember that very clearly... Stormy sitting there warning everyone that some would loose out and the best action would be to spend as much as possible...
At that point i didn care, but had I known i would loose out on approx 350K dil, I probably would have spend some.