September 7th, 2007. Ten years soon and only a single account. Profile shows me joining in 2015 for some reason.
Winter 2010ish 6 years later I came back thanks to the Vita announcement. Also stayed because game was more affordable
I started off as a casual player in 06 and started playing ranked in mid 07. I can't recall exact dates as I do not remember the info to my old account.