not sure about ggl. never had problems.. Clickbank does break the frame, but only on the order page. Hop tracking works fine still.
landing pages should do most of things you mentioned. the ones that do well dont try to sale. they give information about a product with a link to that product. the sales page should sale them. If it has a crappy sales page, I would second think promoting it. Also remember, these sales pages are designed to sale and many of them do it very well. For a lot of products, a review page works great. I am currently promoting a product that converted 1 in 40 when I directly linked it to the sales page. I put up a good review landing page and now I am converting 1 in 20. I make about $125 per 100 clicks. I have another that converts 1 in 15 in a highly competitive niche. I would show them to you but dont want the comp. In short, A GOOD landing page almost always converts better than directly linking to the merch.
I use ppc so i know how many clicks I have. I then know how many sales I have. I then divide number of click by number of sales.
So the consensus basically was that you can't directly link to the check out page on the original publisher's sales page from your own landing page and that you should just pre sell (review, explain, quality stuff, maybe even an opt in) on your own landing page, then link (with your hoplink) them just to the original publisher's sales page and by then they'll be more inclined and likely to buy? This is a bit off topic, but does spybot or any of those products delete or block your cookies from your hoplink and negate your credit for the sale? Is that how that works or is that not an issue?
There is nothing wrong with the ClickBank's cookie if it places one. If a software deletes this cookie, it just steals from the affiliates if you ask me and that is not a good business model for the software itself.