My only objection to people I suspect are "sandbaggers" are in stroke play games where they max out there shot limit when they are within feet from the hole. This spoils the game for the other players. Yes, I have witnessed it and it is one of the few times I have quit mid-round.
As for complaining about "sandbaggers" in MPC matches, well I have little sympathy, as one post as indicated, they are often looking for an easy pickin by playing people outside of their tier group. While masters (or pro's) look for easy prey there will always be "sandbaggers"... call it cosmic balance!!
Having a separate tier for match and stroke is not feasible, as no record of the number of shots are taken into account (you can shoot over par and still win a hole). Surely the most sensible idea is to only play against opponents from ones own tier, then there is less chance of encountering one, especially as you move up the proverbial ladder, thus providing for better matched competition.
I was going to say that there may be a point in Ready-Go tourneys, but does it really matter as a good player regardless of tier is always going to dominate the leader board. To my knowledge these competitions are not tiered, as such the "sandbagger" argument is quite irrelevant.
Just a thought...
Cosmic blessing to you all : )