So I get this email for an offer and when open it.

[musicyouneed]

So I get this email for an offer and when open it.  It says it is by invitation only, WTH?

[esclyons]

was there a link provided.

[musicyouneed]

It was where it shows activate offer.

[musicyouneed]

I figured it out, it was on my other id that I don't use. 

[reallynicestamps]

Yep-- all promotions are for the benefit of eBay.

That one seems to have been meant to encourage dormant IDs to become sellers.