Million plus transactions a day, that's a big value, seeing how people interact, ways we can measure behaviors, develop tools to handle cheating, but also provide input to product decisions we have to make.
That said the places its most valuable at are scale, things like 200k objects in the auction system and people killing NPC's and running missions, leveling, etc.
At some point, these become less useful and a wipe makes sense.
That said "approaching with a DevOps point of view" is literally the entire way our systems are set up, happy to walk people through it at some point.
However nobody would play if we wiped every couple of days, there has to be a balance in there somewhere...