Edit: ugh, please, PLEASE tell me you aren't using "ROI" in a forecasting context... ROI is a measure of historical activity, not to be used for forecasting, this place is full of crap information btw and that term is molested here on an hourly basis. This is a good place to talk with tech folks, sadly not many Econ nerds participate here. Feel free to dig through my old posts, on a few occasions I went on a rip about ROI and other misrepresented bullshit, now I'm beat down from trying to spread knowledge that nobody gives a shit about, "ya can't save 'em all!" lol... https://bitcointalk.org/index.php?topic=342859.msg3699883#msg3699883