While the ideal flow/funnel is to go from persuasive copy to signup in a single visit, I've often found myself going back to a site/service multiple times over

While the ideal flow/funnel is to go from persuasive copy to signup in a single visit, I've often found myself going back to a site/service multiple times over the course of months before actually signing up. It's probably part of the multiple touch points marketing idea. You may really like a service, but have to wait until you actually come across the problem the service is solving before committing to the buy. The point being, I think it makes sense to have a sign-up button on your landing page (for return visits) AND in your copy (for first time visitors).