I was one of those idiots way back in the 90's who payed £700 for a PS1. At the time it was worth it as it was mind blowing. Not sure I would do it now being a bit wiser.
They sould do nothing.
From day one you and Oculus choose to live in a capitalistic economy, so don't be surprised if some people is trying to make easy cash. From day one we have concurred that getting easy cash from other people needs and whishes its ok and perfectly ethical.
Not that I like how things are...
What does capitalistic economy have to do with anything? You can have this with any economy, lol.
Anyways, they already have something in place - NO SUPPORT. Aka, people that buy those rift will be at the mercy of the reseller if there are any problems. Oculus has and will check on the purchaser information first and will deny help if any information is found that the item was resold.