"... tend to profligacy" was really bothering me as well, until I figured OP probably meant "tend" as in 'take care of', and not 'inclined to have'.

It's "incline", the subtext is: "Reader, you might start thinking of a certain common stereotype at this point, but don't do that, because my argument is very different, and that stereotype is irrelevant or possibly untrue."

Compare to: "A pick-up truck is a useful thing to have, not because you are insecure about your genitalia, but because you can take home bigger products from IKEA."

Thanks, I misread entirely.

No, "tend" means "incline" here, but the normal grammatical reading of the sentence does not suggest wives have profligate tendencies.

Ah, I misread. Thanks.