How to use Verizon upgrade on Nexus 6? topic

I'm on a family More Everything plan with shared data on Verizon and I finally became eligible for an upgrade. I'd like to know how I could use the upgrade to get a N6. What I've heard is that some people are upgrading to an iPhone 6+ and then selling it, then buying a N6 at full price. But I don't understand the details of that. Wouldn't the iPhone be activated/used at that point? How would I sell it at a new phone price? Also, I heard that Verizon charges a fee if the new phone isn't activated within a certain period after purchase. Would that be a problem if I bought the iPhone first (and didn't activate/open it), resold it, then waited for a N6 to become available to buy?