redeemable files is just one factor. many people MR to gain status for other benefits such as above mentioned lounge access, upgrade, standby listed higher etc. and the more you fly they more you would value those benefits as you use them often, so how much you would travel next year, in what pattern, could be determining factor whether you should do MR to get higher status.

I did segment runs to get EXP because I want the free upgrades and SWU for next year's china trip...