Chris Blattman has a post with great comments (read the second one by Bill Easterly and the two by April on WB compensation).   I don't think that moving to economy would greatly affect the budget, it's more a symbolic thing. 
My two cents: I used to care less about BC travel and always (or almost always) travel economy, but the older I get the more I give value to BC. I would try to avoid more missions if I had to travel economy (of course, this may still be optimal from society's point of view).   
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