They're really only beneficial to newer buyers who won't be risking duplicates and who aren't fussy abut materials that aren't porous as they're probably going to be mostly jelly rubber etc. Plus a lot of toys seem to be very girthy, those of us who can only take smaller girths would end up with a bunch of ornaments.
I seem to remember last time around most people were cancelling their mystery bundles once theu found out what they were getting