One thing is sure PPT has become very attractive for investment because of its current price. It was on my watch list from the start how it went up over $65 and now its present price of under $5. I don't know how effective the invoice trading platform is but in short to midterm based investment is seems good choice.
I think for the present condition all tokens experience a decrease in value and that happens in POPULOUS. we have to be patient, I also experience it. I'm sure this team is trying to overcome it.