Sophisticated users will reveal sophisticated usability flaws in your application but even unsophisticated users can reveal the unsophisticated flaws.

One really great tip (for sober testing, not drunk) is to use role playing. If you were soliciting feedback for a blog analytics package for example, you could tell users "Imagine you're the CEO of a lollipop manufacturer". Most people end up getting really into the role you're asking them to play and ask surprisingly insightful questions.

That being said, you still need to test with sophisticated users but they're much harder to get and their time is expensive so it's always a good idea to test with a few unsophisticated users first and fix the obvious usability flaws so you can maximize the amount of relevant feedback you do get from your sophisticated users.

Doesn't sound like a consumer application. Given that your profile mentions 80legs, I think you're in the B2B space.

Well, that was sort of the point of my original comment. The test will work if bar-people represent your target customer base. This won't be the case for B2B products and may not be the case for some Consumer products.