How much should you reveal before forcing contact?

I have a b2b/b2b2c product that is growing in popularity and I wanted to get some opinions on how much information is worth revealing to prospects via your website - before it becomes counterproductive.

For context, the product is highish value and the sales process is very manual - you can't self sign up. We use the website to generate leads but I do wonder if we provided more information up front whether we'd end up with more leads.

I understand with prospects in particular the education phase is important to progress into a buying position. I've considered actually including videos of how certain features work, at demo level detail, but the risks I see with that are:

1. Competitors also get a better understanding and might seek to copy or reposition their own products.
2. Prospects misunderstand, coming away thinking it can't do something and disqualifying themselves by mistake, before even making contact.

Have you ever faced this situation? How did you handle it?