I would say $70 would be pushing it for 2 people. For 3 people or more, especially by adding the breakfast convenience - it brings the value up considerably. If you read Glo's (?) thread anchored at the top of this forum, you will find the food listings there. It does take a lot to make up $70 per day.
The biggest convenience is breakfast. In my instance (diabetic) it is even more valuable - run down the hall - get food in the morning right away - no travel to a restaurant - no wait for a table, etc. They have wonderful fruit trays, toasts, bagels, cereals, milk, coffee, bottled water, etc. We had an excellent breakfast every morning.
In the evening, we only made it a few times. Fruit, cheese, cookies, crackers etc. We usually grabbed a couple of canned soda and then traded for cool ones in our mini-fridge. ( I HATE ice in soda!). If there are cookies left after 7, they left them out along with soda. So often we could grab a cookie & soda even if we were back late.
If you don't upgrade, maybe checking on any complimentary upgrades when you arrive - do you have a Starwood card & points? Check the Starwood thread on this board also.