The majority of Queal users don't use Queal for all three meals per day.
Usually either breakfast or lunch, or both of those.
With regards to the cost; That would depend a lot on the country you live in.
For instance, for Denmark or similar, €240,- a month is not a whole lot.
But for Spain or Italy, that would be above average, I'm sure.
Personally, I replace breakfast and/or lunch most days, and dinner only occasionally.
For me it saves me a load of money, as I'm replacing expensive take-out lunches with 'cheap' Queal.