I would really doubt it, for at least two reasons. One is that the mattresses aren't being used in a "regular" way that would lead to irregular wear (e.g., it's not always being slept in on the right side, or whatever).
The bigger reason is that most mattresses aren't two-sided anymore. Used to be that mattresses could work with either direction "up". Almost all mattresses now are one-sided, with one side that's supposed to be facing up, so flipping it wouldn't make any sense.