It's a really hard question
You cant say when a hyip become scam, the best thing you can do is dont put all the eggs in one basket, colect as much information as you can about your hyip and dont be greedy, you can survive ^^
you are right about that
we have to be crafull and don't be happy with small earing and put all our money in one porgrame
u can invest in the monitored site sou have more chance of don't lose
I usualy use that step,
but after that we have chosse which one. in this chase, I sometime chosse from the start date that program. if not chosse the newest one, I will chosse the longer one.
of course it should be good for my pocket