IMHO there is one probem with daily...monthly...yearly targets:
They just don't work.
In the markets, one can seize opportunities, but sometimes there are simply none, at least not in the markets one trades or not exploitable by the methods used.
(Yes, AFTERWARDS one will always see opportunities everywhere. However, this is irrelevant as long as one cannot place after-the-fact-orders, and last time I checked no broker offered this order type.

...oh, things would be so much simpler then. )
So setting targets will only result in those two things:
1) Not seizing opportunities, because one has already reached the target for a set period - thus, leaving money on the table.
2) Seeing opportunities when there are none, because one is behind and wants to reach the target until the end of day/month/year - thus, making stupid trades which usually result in losing money.
Add to this that even a profitable traders usually has only a quite small edge in the market to begin with, setting targets is a surefire way to lose money in the long run.