I think the point is that you should be "practicing" against players of your own strength. If you can beat them, your rating will go up and you then deserve to play against more highly rated players.
Think about the 1500 players -- they want to play the 2000 players, not the 1000 players. Stick with it, and you'll get there. If you want practice against higher rated players, try the computer.
I don't like this online chess filter. I want to play a tough player (1500+) for practice and I can't. Fix this please?