Not surprised that they bought too many groceries- they mostly ate out during their time on AMI.
When we go on our beach vacation each year, we always eat breakfast in our rented home and pack a lunch for the beach. Not only is this cheaper, but it saves times. We don't want to be bothered spending the time to go to a restaurant to get breakfast because it's a time suck. Much easier to get up, eat some cereal or bagels, put on our suits, and get to the beach. After all- you go on vacation to enjoy the sand/ocean/scenery, etc...not to sit around eating!
Oh, but wait- the Trackers are bored with their vacations so I guess beach time doesn't matter to them.