Does the length of a sales page affect its conversion?

Comparing the first two products you listed in your first post,
1. The Get Lean Program
vs
2. Program Yourself Thin

The Get Lean Program has a gravity of 9.13, and the Program Yourself Thin product has a gravity of 0.88

The Get Lean program, with a gravity of 9.13, has a fully fledged sales page with long copy and testimonials, among other things, and it all looks professionally created.

The Program Yourself Thin product, with 0.88 gravity, has no clear sales page and just seems to be a blog.

So, in this case, regardless of what you say, I think the Get Lean Program will convert better than the Program yourself thin. Although I didn't say gravity was an indicator of how well a product converts, I said it was an indicator of how many sales it has made by distinct affiliates. But looking at the two sales pages together, I think it will convert better too.

As for the video sales page, I can't find the gravity score on CB for this one, it must have a different name, but plenty of authority figures in marketing - including Clayton Makepeace - have said that VSL convert better than simple copy, so I'd be interested to see the gravity score on that one and it may be the winner of the three - The Get Lean Program does have a decent sales page, but it could be better.

Price is another issue, though. And I didn't look at that as we weren't discussing that element and I've spent enough time already trying to prove my point.

I'd say that the very fact that the long copy seems boring to you makes it obvious that the niche isn't for you. If you're going for weight loss and diet because you think it's the highest converting and the most profitable and not because you're into the subject, then there's a high chance you'll fail.

Weight loss and diet are among the most competitive niches.

As for the length of the sales letter... Usually, in my experience, the longer, the better conversion. Especially for unknown authors and products.

But ClickBank very clearly tells you the conversion in recent weeks through gravity.

Hope this makes sense.

Thank you Rick

What if you are facing two choice: long sales page and video sales page

Which one would you consider to promote? or is it depends?

I'm not sure who in that list you are referring to as the world's highest paid copywriter, but if it's true you shouldn't have a problem providing real world examples of their work. This person should obviously have done work for very big companies involving very popular items. Their work should be all over the place. So who is it and where can I see their work?

Then maybe you better read that famous work before thrilling us with bold text of varying sizes. There is a big difference between the books and columns in your quote and a squeeze page. His advice has ZERO to do with Internet Marketing.

Then again, quoting a marketing expert who died in 1932, a good 60 years before the first Internet spam was ever seen, is quite the joke anyway. Today's shopper is ten times smarter than they were even five years ago, and long form copy DOES NOT work in any mainstream industry.

You educate your consumers with lots of text, graphics and videos, but you don't do it all on one page and with a "Buy it Now" button every third paragraph. That's purely an Internet Marketing gimmick for selling guru information in a small handful of industries.