It's so we can charge people exactly what they're willing to pay instead of creating an average that is a discount for the people willing to spend more and locking out people not able to pay it.

It's also a really good filter for bad customers. Partly because "if you have to ask you can't afford it" and partly because SaaS is sold to execs, not users within the organization. Most people coming to ask about price first are the users that just want something for themselves or a small team, which is not an ideal customer.

Basically if you move on from the site because you can't find the price, that's by design.