The operative word at the low end would be "adequate". the $3. 99 basic car wash is pretty much as advertised, suitable for rinsing off a light layer of dust if not much more. Bird bombs remained intact, At 5.99 and up, it's no Los Olivas but you get a pretty decent automated wash, rinse, and blow dry. There's also no extra charge to use the really powerful self-service vacuums regardless of price of wash.
You get a decent, speedy rinse and blow dry for cheap and an adequate wash, rinse, and dry for just a bit more. And watch those vacuums: they suck - In a good way, strongly.