For pyramid, ponzi schemes and hyip.......the earlier you join and exit the better.
The early ninjas to join reap good cash, and they are handsomely rewarded in order to 'testify' and 'entice' an avalanche of money hungry individuals who are then milked their damn balls dry.
Join them early if you can, and put what you can afford to lose without committing suicide, for taking risks isn't bad anyway. When you get your returns and profit take your buttocks away from the scheme fast, don't loiter around battling with appetite to continue risking. Run, eat and wipe your mouth in solitude.
Only,
Don't join any pyramid scheme when it is the talk of the town, for then is when the brains behind are gathering their last pregnant reap.