On a personal level that is certainly true. But not when you speak generally... then would be generalizing your opinion and need of a library.
And I'm again going into semantics. If you just say that your sale will be thermonuclear then I won't just take your company into consideration. Just like if I'd tell you I'm working on a ground-breaking project you wouldn't expect I only reference previous work I have done... in that sense producing a simple piano library would be ground-breaking to me because I never produced a library.
So, if they'd just say - be part of one of our biggest (or the biggest) sales there would of course be no problem at all. Rather than implying it's epic and big in general.
Nice discussion this, in waiting for the mail!
I don't think your analogy is apt here. A 'groundbreaking project' inherently refers to projects in general, I think. 'Take part in our wishlist-sale which is going to be thermonuclear again' refers to a particular sale of a particular 'we'. I don't think you can say 'I hardly do any projects, so this one is groundbreaking.' whereas 'We hardly do any sales, so this one is thermonuclear' is perfectly possible (in my mind).