Is pages cross-promotion effective?

Is buying status updates from large pages to kickstart small pages effective? What about CPA offers?

Thanks in advance

It depends how large the fan page is, how fresh it is/the members are and if your page would get any members from it, i.e If your niche is to do with cars, and you do an update on a fan page to do with animals, there will be a lower conversion rate than doing an update on a fan page to do with cars etc.

Yes, it works very well, I do it with all my pages, although non are niche specific, they are all just fun pages. But in my experience with this it has worked.