I've come across a number of products that sell themselves because they've solved a problem I was having. A lot of these went on to unsell themselves with things like "contact us for pricing". A sales team might be better at maximizing sales, but that isn't necessarily a good thing.

One that's bucked this trend lately has been atlassian, they're a 5 billion dollar company without a sales team that operates in a space that typically requires sales teams. Transparent pricing is a huge part of their success.