it depends what are the methods. If they are too cheap it's usually not worth it, they just put pixel iframe so people don't even see your website. research on google for the provider before u buy. those with 20.000 for 5$ are probably pop up windows
Any one have any experience buying traffic from any traffic providing website...I see alot of them offering 20,000 unique visitors for under $50...could this be real?? any input is appreciated