

Only on expensives items or antiques. I don’t like it, but it seems to be expected on marketplace. I’m so used to people haggling I post everything 25% higher than the amount I actually want or expect.
That being said, I always think it’s funny when someone posts obo on their item. If the price is 700 obo, why the hell would I offer you 700?
I do everything myself, and it’s led to being able to handyman if I need some cash. Contractor pricing is insane for something that’s never as difficult as it seems. Hell last night I installed a side door on my garage because I had an extra door I ripped out of the house last year. It took three boards, a nailgun, a shim, and an hour.
The job you listed? A wrench, Teflon tape, some valves, putty, and a diamond hole saw. So like 70$ assuming you don’t already have those things.
Most maintenance, installs, or upgrades are the same way, and the next time you do it, you already have the tools. Get a rolling toolbox, a belt, a basic battery tool set, and pick up all the specialty tools as you need them, and you’re a handyman.