PIXFI decreased from $0.099 to less than $0.04. But now at $0.42. I can remember that NOT decrease from $0.000999 to almost $0.0004 but later increased.
About investing or not investing in the coin, you can use the money that you can afford to lose to invest in the coin. It is possible that the coin may rise or it may fall.
Regarding the Notcoin rate you mentioned, you must have over-exaggerated, NOTCOIN listing price was 0.0096, it later decreased to $0.005 thereabout. it was never at the rate of $0.0009 as you've said, The present rate of NOTCOIN is $0.01582.