A FlyerTalk Posting Legend
Join Date: Sep 2009
Location: Minneapolis: DL DM charter 2.3MM
Programs: A3*Gold, SPG Plat, HyattDiamond, MarriottPP, LHW exAccess, ICI, Raffles Amb, NW PE MM, TWA Gold MM
Posts: 100,417
Open jaw doesn't make much difference when one ways are priced at half as many miles as a RT. In fact, one could book it with a double open jaw (open jaw on each end). There will be a difference in change fees for those who aren't DM or PM in that cancelling two one way award tickets will cost twice as much as cancelling a RT ticket.
The big loss is free stopovers, which I've used sometimes to get availability.