How long has Paid-to-post been around?

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How long has Paid to Post been around? When I started joining in a few months ago I got the impression that it was still a fairly new internet fad. Then I see people with ratings in the thousands. It leads me to wondering are they just prolific posters or have they been doing this for a year or so. Luckily it shows on their page how long you have been with the site so that I can satisfy my curiousity. Because I get discouraged at my own rating sometimes when I see those huge numbers. Most of those uber-writers are lower down in the discussion quality rankings but still the big numbers next to their names are intimidating sometimes.