We cost thousands of $ / month. If you had a problem that you'd pay thousands to have solved, it's probably worth you talking on the phone for 20 minutes.
So it's a good filter for us, for now. Once we bring the price point down, you're absolutely right -- we want to have a descriptive landing page that makes people think "wow, that's exactly my problem!".
Are you the only company offering solutions? If so you can probably get away with it, but if not then it's not just 20 minutes it's 20m * n companies. 20 minutes is generous too, if your website is vague and your sales guys are clueless then it's much more than 20 minutes.
If even one of the competitors has a sticker price and publicly available documentation then I'd be evaluating them closely before even considering you.
If you can't spend 25 minutes looking for a good fit solution then you are not likely the type of customer anyone wants to deal with in the first place.
So it's a good filter for us, for now. Once we bring the price point down, you're absolutely right -- we want to have a descriptive landing page that makes people think "wow, that's exactly my problem!".