A slew of responses off the top of my head...
I wouldn't play-to-play an RPG in a public, commercial space.
But that's really only because I don't need to. I play with friends in a private space.
If I spent 3 hours in a coffee shop, I'd spend more than $5. Because even though I avoid fancy coffee drinks like the plague, I'm a sucker for fancy, and even not-so-fancy, pastries.
If I spent 3 hours in a bar, I'd spend a lot more than $5. In fact, I'd probably spend $5+ on my first drink, because I love fancy beers, good whiskey/bourbon, and proper cocktails (meaning no g-gdamn "appletinis").
Really, $5 is a trivial cost for a recreational activity, even when you're staying in (hell, the slice of cake I bought at Whole Foods last night to share w/my wife cost $3.99)
In theory, I have nothing against a for-pay "3rd space". In fact, I think there's an untapped market for direct "3rd spaces", outside of the coffee shop & book stores-you-can-linger-in model (because the latter is going away, outside of the major metros).
(A "3rd space" is a place to hang out that's neither work, home, or in front of a 7-11. I believe it was coined by the Starbucks marketing team.)
Come to think of it, under the right circumstances, I probably would pay money to rent a (more generalized) recreational space.
The bottom line is: these stores need a revenue stream to stay in business. If you want to game, don't have a campaign to play in, then even a per-session fee around $5 seems like a good deal to me.