If they wiped, they would be deleting rep/loyalty possibly paid for with real money. Riots would ensue, and probably a class action lawsuit, because they can’t just release the game + DLC on Steam to then undo the effort people spent on the game.
Basically, if they wipe, brown stuff will find itself impacting a fan. So yeah, I don’t really see it happening
Open Beta = Release, these days. Especially with games like this. MWO did it, Hawken did it, Path of Exile etc. None of these games wiped after going OB.
It’s a necessary thing for funding further development, and pissing people off by wiping post-release would be counter-productive.