Yes, exactly that.I guess it’s like me quoting £1150 to swap out a fuse board the customer just picked up from tool station
And there are probably many reasons why you'd give that quote - maybe you'd spotted the customer's Rolls Royce and Bentley in the driveway so thought they'd be happy to pay over the odds for a quality install, or perhaps, after a site visit, you knew the job wasn't for you so you bunged in a crazy quote that you'd put no work in to. If the customer accepts it, you're quids in.
I'm sure there's some irony here, somewhere.