My personal experience is if the salary is high enough, lunch is a non-factor, you'll want to actually get out of the office and get some fresh air. $15-30 a da

My personal experience is if the salary is high enough, lunch is a non-factor, you'll want to actually get out of the office and get some fresh air. $15-30 a day for lunch is a rounding error. 261 work days in a year * $20 per lunch = $5,220 a year. I'd much rather get away, go out with colleagues, friends, try new lunch places. Optimize for happiness.