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.
Thanks for interesting, valuable hints on price trend of Populous.
After found your thread, I took a glance at price chart of Populous, which is very interesting one.
https://coinmarketcap.com/currencies/populous/#chartsAdditionally, the rank of Populous on CMC is very high, above 50.