I've never had any luck buying traffic for my blogs...probably have spent over 100$ for thousands of hits and only 1 sale came from it, tried a couple of the big providers but never had any luck..and yes i targeted my traffic to the niche
SEO traffic takes a little time but if you have your site tuned for the spiders (non dupe content keyword rich regular posts, backlinks with good anchor text, robots ect ect) then you will start seeing traffic in a reasonable amount of time and this traffic is obviously MUCH better than bought traffic....just my experience so far
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