should I purchase the dining plan from disney world?

Me and my boyfriend are leaving to disney world in may we are staying 10 nights 11 days disney offered is the dining plan but it will cost is 800.00 actually a little more it was 847.00 we made a reservation at planet Hollywood and chef mickey and we plan on eating at rainforest cafe and maybe the coral reef restraunt but other then that we’ll get quick food. SHould I buy the dining plan for 800.00? What would you do?…. one more thing I’m 20 and my boyfriend is 21. I don’t know if that makes a difference.