You guys get ID75 discounts on most (if not all) airlines with which you have an agreement, right? As in, 75% off full fare? Full fare (I'm not talking about what you find on Kayak, I mean the most expensive ticket possible on an economy seat) is very expensive, and even with your discount it may still cost more than you'd think. And you're still not guaranteed to get on (on the bright side, tickets are flexible). I would honestly advise you to find out exactly how much it will cost to go confirmed vs. standby and decide if it's really worth not knowing if you'll get on.

And a more general rule of thumb that applies to even nonrevs flying on their own airline: Places you want to go, like Hawaii, New York on NYE, Las Vegas, Caribbean, Europe in summer... other people want to go there, too. And when that happens, flights are going to fill up. You really have to get used to travelling in the off-season and taking weird routes (which will probably cost even more on an ID75).

By the way, just to give you a ballpark number, I looked up base fare CMX-ORD-FRA on UA. Full Y is $2859. 75% off of that is $714.75. Double that, and that's what you'd pay round trip for the fare alone. But there are also departure taxes, which cost a pretty penny, even when we fly our own airlines (FRA is one of the worst, I think around $150?) and when money is involved, it's even higher yet.

Sorry if your hopes and dreams came crashing down here, but it's VERY easy to get your head in the clouds when you first hear about nonrevving, and some people need a bit of a reality check pretty quickly