Whenever there is a 'contact us' pricing page, I don't even bother. I can't even tell my boss to look into it if I don't know what the required budget will be, and I won't give out information to get contacted by sales teams and waste my time on a project that I wasn't even allocated time for.
Plus it won't even be only my time, it will be finance and maybe even legal. So now there are multiple people involved to get a quote before it's even figured out if the solution fits the budget or if it is even a fit for the problem (unless there is some sort of trial).
Whenever a project does this, it had better be the only thing capable of dousing a burning fire to get even considered.
EDIT: I understand that this is a common practice and a legitimate business model, so it's not aimed at Gravitational specifically. It just causes people to sometimes dismiss offerings that they would be legitimately interested in, otherwise.
For instance, Slack offers paid versions that are not yet at the Enterprise level(so less features), but you can at least get an idea, and also what is the pricing model (is it per seat? per server? per gb of storage? etc).