The responsibility Blizzard has in trying to maintain order in Diablo 3 is intimidating. Already people have voiced their displeasure with the need to always be online, now it appears that Blizzard's decision is justified. Asian servers were taken offline recently due to reports of item duplication, an exploit that would destroy any sort of economy the auction house has already established.
With the Real Money Auction House expected to release tomorrow (according to Diablo 3 itself), Blizzard is already taking extra precautions. Now, in order to add real currency to your Battle.net Balance, you will need to be using a Battle.net Authenticator (mobile or otherwise). Blizzard community manager Kaivax clarified
While these authenticators are freely available, I for one do not care enough to begin engaging in this practice. Anyone feel like using an authenticator will ruin their experience or is this just another security measure many will opt out of?