No dealer would take on an unknown like this.
If you want a refurbished machine, let your dealer source one for you, bring it up to spec and put it on contract.
There's a reason the machines on eBay and Craigslist are much cheaper - and that is not because they're a bargain.
Those machines will generally need thousands spent on them to bring up to spec. Their market is dealers who will spend money to refurb them and sell them on, and people who decide to go it alone, which many times ends up in tears - all well documented on this forum.
From a PM perspective in a production environment where you're maximising the click, double is roughly correct. Check your PM counter and you'll see for yourself.
Unless this C3070 comes fully loaded with 3 x 707 paper decks and a load of fancy finishing kit, then those numbers look very, very high. Check out some other dealers!