I generally do up-voting to the good questions/answers on regular basis.
Recently, out of curiosity, I just checked few users' profiles who were in high reputation cap (10k-100k), say "big cats". I noticed that many of them generally don't participate much in voting even though they are actively answering in SO for long time. They have voted only few hundred times.
We all know that most SO users want their reputation to go high. Isn't it selfish/miserliness on their ("big cats") part that they don't want to vote to other's posts, but still secretly they desire that others to upvote their answers.
If someone argues that, "they are choosy about quality of answers", then we can counter-argue that their answers are not always perfect.
SO is not everything about reputation, but one should understand their responsibility also.
After all these description, is the title question justifiable ?