Very fair point! Just like with Beeminder, if you're lucky enough to simply not suffer from akrasia then all the craziness with commitment devices is entirely superfluous. I liken it to literal myopia. If you don't have the problem then more power to you. If you do then apply the requisite technology to fix it (glasses, commitment devices, decision auctions).

But actually I think decision auctions are different. There's no such thing as not having the problem they solve. Preferences will conflict sometimes. Just that normal people have perfectly adequate approximations (turn taking, feeling each other out, informal mental point systems, barter) to what we've formalized and nerded up with our decision auctions.