I don't think so. Its not a line limit, its a mean length issue. If you spend more and empty the line, then you haven't made a dime more. In fact if you spent money doing that, you lost money.

That's the issue - if the customer pool is inflexible, the rational thing is to raise prices until you hit that limit.

Now if the line is self-limiting (folks wont queue if it 'looks too long') then there's something to that.