So, the Elevator Pass seems, to me, to be a good idea - less than half the price of a monthly fee for most MMOs, for a month's worth of energy-free elevators? Sure, sounds like a plan, $6 would be something I'd gladly spend - but for the fact that it'd take a week or two to get my money from my bank to Paypal. And from what it looks like, elevator passes are pretty much the same as energy purchases - you can only buy energy (with real money) for yourself unless you pick up a gift pack, which, of course, elevator passes don't have, meaning that I can't have one bought for me even if somebody wanted to.
So, my suggestion is, make elevator passes giftable upon purchase, or possibly a useable item like the slot tokens are. $6 is a good enough price but some of us can't pay that for various reasons, so the option for someone to buy one and trade it over to a friend would probably help increase sales of said passes.
Notice how it says elevator passes are a limited-time offer? They're testing the waters. That means they can't turn them into usable items (yet), because that would result in people stockpiling them and continuing to use them long after the test ends. Similarly, if they allowed gifting, people could sit on the gifts without accepting them and use it as a way to "save up" elevator passes, and OOO would never be able to get rid of them.
I imagine these ideas will be revisited when and if they dedicde to start offering elevator passes on a permanent basis.