I think we should inform the user about the accept rate, if he/she is having much lower accept rate. Because if the user is not checking out the correct answer, non of the future user's will get to know what was the exact answer for this particular question. Some user's might think that this question is still unanswered. So, might look for another solution. SOSo, it would be better to let the user know that "You should check the appropriate answer, so that the future user's can get benefit for the same."
Other case is that, if a user is new and he doesn't know about checking an answer, we should inform him about it.