Last time I said that out loud was when I got a freebie tiger-striped number out from under the in-laws' barn (where the mama prudently stashed her offspring until they were big enough to intimidate frenemies by hissing).
So yep, she stayed low-cost behind routine vet care until one day she took on a motorcycle on the county road. She lost that round but survived, received expert care and a couple pins in her leg to the tune of approximately the cost of one of today's Apple notebooks.
The cat did regain full mobility, and she never approached the road-edge again. The vet was so proud of his handiwork that he used to stop by once in awhile on summer days off to admire the proof of his expertise... she'd be leaping around in the upper reaches of a black willow tree in the backyard, trying to dodge attacks from barn swallows that had taken offense at her sitting in my barn waiting for baby birds to fall off the rafters.
On the occasional wintry morning when she'd come in through the cat-door after a patrol around "her" turf, I'd reach out to pet her... but about that time the temperature change would have reached one of those pins and zing her leg and she'd sink her teeth into my wrist figuring I must have been at fault. She'd had her rabies shots but it occurred to me to go update my tetanus booster...
So adding up all that extra expense and throwing in cost of coffee and danish for whenever the vet stopped by to admire the recovered agility of his patient -- and sometimes he'd bring along an intern!-- all my so called freebie cats, whether from barns or shelters, became indoor-only kitties.
Jes' sayin'... there's low cost and then there's high maintenance. 🙀