Ok, this is only my own opinion but since you ask
I feel it's stupid firstly because DJing is an art form and everyone from the beginner to the mega star practice it with his own feelings. So, even judging the technical side is a no sense. We can easily tell which DJ we love (and hate) but it's hard, even impossible to tell who's better than the other.
Also because it goes opposite to everything electronic music was about when it first started. Techno and on a larger vision electronic music was fighting against rock and pop stars clichÃ©s when it first started.
Today it's exactly the same unfortunately.
Now, sending links to fans is maybe 'acceptable' since it's part of the 'business'... But sending those same links to everyone including peoples who don't have a clue of who you are is a shame.
I personally delete all messages from DJ's asking to vote for them. Since I don't believe in this practice first and also because most of the DJ's I feel true to the music don't need to be in the TOP 50 by asking... They eventually end up there naturally.
My two cents.