Can I use an upgrade to get the iPhone 5 from Verizon and then sell it on Ebay?

I have a verizon upgrade so i'm going to upgrade my 4S to the 5 because i want to sell the 5 on Ebay. I chatted with people at Verizon and they told me that you have to activate any upgrade within 14 days of receiving it or else you get charged full price for it. So i will activate it and then immediately re-activate my 4S on that line and then sell it. Anyone see any problems with the plan?

I whould buy it if you selled it on ebay: D

What's the point, if will cost more than you can sell it.