You should definitely get suicides... defenders won't take damage from it and attackers specials will don't so much more damage its a no brainer. I'd invest asap, it's not that hard to get just manage your units better.
Am I really going to spend all my units for a BG season..Of course I am! -JOC
Looking at it from both sides, the fight time you shave off by using suicide masteries, can often be offset by the time shaved off by your defenders losing health from recoil.I am always happy to face an opponent that has suicide masteries. Since the defender throws at least 2-3 specials each match, that's free damage to themselves to help with my fight time.