I didn't for 2 reasons:
1) All the information available was that dining food wasn't starting until the second day of my trip. Why pay the extra if it's going to be the crappy meals posted about here for 1/2 the meals?
2) Money. I didn't have an extra $250 for the 'low' bid for a sleeper. I definitely didn't have the $450 for the good bid. Sure, I could justify it by saying I'd get more than $250 value out of the food options, but I don't think I would have, plus you have to have the money to spend. We spent $13 in the café car instead.