Consider buying manufacturer refurbished lens if used bothers you. Test it yourself. B and H undoubtedly has a flock of lenses returned for real issues and a second flock of lenses returned for cold feet, imagined or camera body specific issues (poor match to a camera without microadjustment), or can't use the thing.
I have a few favorites that I bought used locally. My local dealer allows 1 week for testing. Even the new lenses I take out in the store's parking lot, quickly shoot brick walls and other cars, into the sun, close-ups, whatever, bring lens inside, note its serial number, and tell the sales person that I will review the photos and call the next morning to buy or not buy the lens. That has worked out well for third-party lenses.
I would consider buying a used lens from LensAuthority.com, Dr. Lens Rental Roger Cicala's sales site. The lenses have been retired from rentals after 1 to 2 years, whatever their mileage, and tested optically, mechanics checked, and graded. I'd buy primes this way in a New York minute. I'd consider buying zooms, too. They do have a warranty. It may be like buying a used taxi, but at least it is a used taxi that has been thoroughly inspected and tweaked.
I have also bought off eBay, one excellent M42 lens, one less than ideal Nikkor (it had an ugly exterior, fine, that was why it was cheaper, but it also had lost much of the helicoid grease, so it feels too loose and without damping, not the proper feel for an all manual lens. Optics are up to spec. It is usable.)