If you get one them from high rank account your account is dead. You can't learn from it.
I think I misread it the first time, did you mean earn, not learn? Since you mention bounty abuse, I presume you have in mind bounty spammers, right? Always thought they associate themselves with earning and not learning.
![Roll Eyes](https://bitcointalk.org/Smileys/default/rolleyes.gif)
Anyway, after mentioning feedback spammers several times, would you be kind and share which DT members have abused their status by giving excessive ratings? Give us a few examples.