My guess would be because its to the players benefit (ie: the mission pays 10 romulan marks repeated daily.) and without it increases the grind, which is to Cryptics benefit.

Look over the major glitches that have been fixed. Anything that got the players ahead, nerfed. Anything that sets the players back, ignored and put on the back burner. The Tau Dewa sector and New Romulus are so bug ridden it doubles the normal grind for marks.

Ever wonder why there are no events that pay out in Romulan Marks, or even give you a bonus?

Romulan Marks are Cryptics way of controlling how fast players progress. They won't fix these bugs any time soon. They have a whole new update incoming to screw more things up with.