I really wish that were the case. Alas, more and more sellers think it makes them look cool and enterprise-y if they go the "contact us" route. Possibly the most ridiculous I encountered was a browser plugin startup offering that ended up costing something like $2/month/user with a 20 user minimum but even during the demo they were all about "Fortune 500 this and national ISPs that".
As far as actual very large enterprises are concerned (pardon the pun), there might even be some truth to that: I know procurement guys who would only buy if they got the white-glove/wine-and-dine treatment and would have never bought something with a corporate credit card on a website that said "click to buy 35,000 licenses now" (you can do that with Atlassian IIRC).
Fair enough.
But for 99% of companies (i.e. SMB) it's just annoying to the extreme, especially if you have to do this more than once per year because your org is restructuring, your CTO is actually the CFO and reads marketing whitepapers and case studies to follow the latest tech fads, or you're in consulting.
I say, offer both: An SMB plan with listed pricing (segment further at your leisure) and an Enterprise option with "call us". If you don't want SMB business, be honest about it and say "enterprise only, we only do bespoke, don't call if your budget is <50k".