Phising and many others scams became so easy (and probably profitable) because of the massive number of unaware people eager to earn. Not to mention that most are always trying to find the 'easiest way through' in earning forgetting the fact that it shouldn't or isn't always work like that.
Quoting this (obviously from OP himself):
Lots of new users are not aware of this. Because they are tempted to accept tempting offers without noticing anything. Scammers know very well that a large part of those who are targeting these emails will fall into this trap.
I totally agree. Only the wiser would overcome such certain traps and would always aim for plausible opportunities.