Not always
I've been here for over four years with a total of over 4 million points, and I have probably received about 15 notifications thus far. And it's already approaching 2:00 PM!
Mind you, I've submitted about 5 memes already with about 4 people replying! It's depressing.
And then people wanna know why I go to the "BEGGING FOR UPVOTES" stream!
And even there, I hardly get noticed.