for the potential longevity, what is it based on?
Sustainability of the system.
I'm not against you and I don't own dr-bitcoin.com but I don't agree with your conclusions regards to Dr. Bitcoin.
You didn't even mention they are using custom script, unique template, registered a company, bought EV SSL certificate, bought BlackLotus DDoS protected server, bought many monitors already etc.
We don't know if it is a Ponzi scheme but this is actually paying for 38 days and I didn't see any complaint till now!
Now I seriously started to think that you have something to do with CrazyPonzi somehow because, being a HYIP investor since 2011, I can't accept to see a program who already invested AT LEAST $5,000 receiving such low rating. Well, it's your thread I know but the problem is that you are discouraging potential investors to take part in these big projects.
When you look at a new HYIP, two are things you need to look at: admin's investment and concept.
I can understand your point of view, but if some big fish join? What happens? And their concept seems made to do it. Also their "Top Investors" list on the website can be easily fake. However yes, probably they deserves a better rating.
This thread was born mostly for this! Discuss!

One question: Would you join Dr-Bitcoin now?* Btw thanks for your opinion.
*Edit