The balance isn't necessarily forfeitted. There is a fee, but I'm not sure what it is.

I've talked to the PassPlus team before. They aren't salesmen in the traditional sense, and they don't hound you. It's a UA travel coordinator who you talk to, and I felt like they were generally trying to see if the program was a good fit for me and my travels (which it was not). I wouldn't be afraid to ask for more information.

On a different note, I have it on good authority that the PassPlus Secure threshold for GS invitation is $50K. If that works for you, I'd suggest you go for it.

Also, 2 GS invitations can be had on a Secure Individual account for $50K (first), and $15K (second). If you can find someone else (i.e. GS with a $50K PassPlus Secure Individual, you may be able to "add-on" for the $15K if you can convince someone that you're in the same business. YMMV.

Domestically, $15K/yr is easy to hit, $50K is hard. I bet the numbers of domestic-only GS travelers (excluding HI), who make the GS threshold are few and far between, except for those SAG folks who commute NYC-SFO/LAX in p.s. F.

P.s. PassPlus use doesn't allow for use of a PerksPlus travel code. You can only use one program at a time.