You can prob do better on a used one. Plenty of them here or on ebay.
From an individual, sometimes yes. From a vendor like KEH or BHphoto or Cameta, not necessarily.
Also remember that Olympus warranties don't transfer. Technically you have zero warranty on used lenses, refurbs you get a warranty and can buy the extended warranty if you so desire. (KEH etc warranty used stuff themselves)
There's also the 30 day return period for refurbs; nice to have if you're not happy with the lens for some reason (bad copy, not what you thought, etc).
Depends on the lens and going price...some lenses Olympus sell at a bargain and some they sell way higher than the going rate that are older lenses even.
Bingo. There's no general rule, it depends on various factors. Especially what the value is of having peace of mind of warranty; some care a lot, some care little. Nobody can claim what it's worth for another person. My point on the warranty was to call out that there is no transfer and you're on your own once you're past a couple day inspection period.
Unfortunately, I have to pay sales tax at KEH so they're often a wash relative to other sources.
dougjgreen: no worries, good to remind folks that a warranty is nothing more than an insurance policy to pay for repairs. I'll accept 5% as a general number as I'm sure you realize that the actual probabilities of needing the warranty will likely vary based on many factors and I have no better number to suggest.
It's interesting how, along similar lines, a like-new used item ought to be valued at substantially close to the new price but isn't. A camera body that's seen a small number of shutter actuations might have served well under 5% of its useful life, yet the used pricing doesn't reflect that. Olympus refurbished E-M1 or KEH used EX+ grade are both around $1040, representing a 20% discount from the $1299 new price at Amazon or BH (which are both $100 off MSRP)
Emotion and perception are clearly factors in equipment valuation. However illogical that may be.
Well, with used equipment, you have the combination of no manufacturer's warranty, as well as the consumption of some fraction of the item's useful life, combined again with uncertainty related to the integrity and knowledge of the seller. A vendor like KEH may not have an issue with the last point, but random ebay sellers certainly do.