I found some services which offer to buy traffic.
buysitetraffic.com revisitors.com perfectraffic.com
Has anyone works with them?
Or maybe You have own experience with another services?
Is this idea useful or I waste time?
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These services almost certainly are a waste of time (and money)
The traffic these sites drive is generally very low (maybe not even human) and the odds of you converting these visitors into sales/leads/any other goal on your site, is very remote.
Google doesn't look at traffic volume when deciding ranking so this would have 0 impact on SEO too.