In a CB marketplace, or WSO marketplace ... the psychology is a little different.

Social proof comes into play.

On CB, it's in the form of Gravity score. In a WSO, it's all the comments/replies.

So yes that will benefit the passive sales your product can enjoy after a launch.

But does a "launched product" vs "non launched" perform better? Has nothing to do with it really.

A launch is like a grand opening for a store. A big hooplah, a lot of buzz, people come, sales are made. But THEN WHAT? If your product only converts and does well during the "grand opening" and your funnel isn't something you can continually advertise .. then it's not even worth launching in my opinion.

There are plenty of guys doing $40k+ per month from consistent advertising, consistent promotions, consistent affiliate recruiting and creative JV deals.

In a marketplace, yes it's worthwhile generating the initial buzz and putting a Promethues launch behind it to focus all efforts on that 1 day (or 1 week or whatever). Because the buzz and anticipation will create higher conversions. The more sales will create more social proof and even more buzz (and likely new affiliates) and that means your offer can enjoy some easy passive sales for a while...

But all of that WILL die out. So I'd first setup the funnel and test and tweak it to make sure that cold traffic from ad-buys converts and hands me a worthwhlie profit. If that's true THEN launch it and at least you know after the launch ripple effects have worn out, you still have a true business.