For fields like mathematics (my field), where grants can be gotten but aren't that big, and people value time more than money, most of us would forgo the summer

For fields like mathematics (my field), where grants can be gotten but aren't that big, and people value time more than money, most of us would forgo the summer salary if we didn't have a grant. It's useful to have the extra income, to be sure, but not having it doesn't break the bank for most people. I did go to fewer meetings when I didn't have a grant, and graduate students working with me would have to TA more. (Math Depts depend on tuition dollars and usually have TAships for anyone who wants one, unlike fields where there are big grants but also teach fewer undergrads.)