Ratings and Math

So when you beat a player that has a rating higher than you, you'll gain more points than when you beat a player who has a rating lower than you. When you lose to someone, you lose more points if they have a lower rating than you, and less points if they have a higher rating. Does this mean that when joining a rated game, it's best to have the lowest rating? If you lose, you won't lose many points, but if you win, you will gain a lot. Should I be actively seeking out games with high rated players, and avoiding ones with low rated players?