For a lot of people it isn't. But if your savings were running out and no prospects presented themselves, you'd never consider it?
For some, keeping the lights on and staying fed during an economic downturn is a priority.
for anyone with an inquiring mind...mcdonald's will never be an option. some people may pick it up as a second job just to keep ahead of the game...however, i would rather just grind it out. though i can't speak for everyone