I had a big lawn when I lived in the country. I’m not really sure how much you save mowing your own lawn, depending of course on how much money you make. If you spend $200 to $300 on a mower, trimming tools, etc., and take three hours to mow, trim etc., it can get expensive. If your yard is big enough to need a riding mower, it can run over $1,000 for a mower easily, and you have to have a place to store everything.
OK, maybe it’s $2 or $3 to mow the lawn, “amortizing the investment”. Still a far sight cheaper than $50, week after week.
And I was intentionally ignoring the opportunity cost.
Anyone who worries about the opportunity cost shouldn’t worry about the $50 to hire someone else.