I wonder what the correlation between people who pack a lot vs. go really light for park going and people who carry a lot vs go really light for races.
I know it's apples and oranges because it's not like there are quick service places to sell you GU etc (though there are margerita stands in some races.)
And I know having kids can equal TONS OF STUFF while in the park whether you like it or not.
I personally am a very light park packer. I tend to just spend more $$$ if I need something instead of having to carry it around just in case I may need it. I'm the one you ask yourself about when in the gift shops thinking "who would spend $15 on sunscreen" etc. I just don't like being weighed down, and it's the same for races.
I don't like to carry anything while running, and would probably do the same for the parks if I wasn't the designated sherpa for the family backpack