Yes, I'm well aware of the fact that the NBA uses number combinations in the current lottery process, and
I know that the NBA used to use actual lottery balls in the lottery process, and yes, I'm aware that they at one time used to draw envelopes out of a spinning wheel, and of course I'm aware that even further back, they used to use coin flips.
But I'm quite certain most of the posters on this message board are using the terms "lottery balls" or "ping pong balls" symbolically rather than literally. Die-hard Blazer fans should all know how the current lottery works after the Oden draft, when myriad articles were written and detailed (ad naseum) about how the Blazers lucked out to win the lottery (or the Rose draft, when the Blazers were just one number from winning back-to-back lotteries).
I don't disagree that it's lazy, because part of the reason I say "lottery balls" is because it's shorter and more convenient than saying something akin to""losing 20 number combinations in the lottery" However, the other (and more important) reason I prefer to say we're "losing lottery balls" rather than being literal is because "lottery balls" sounds more tangible. It's a more colorful expression, IMHO. "Losing 30% of our number combinations" just sounds so dry.
People will relate to tangible losses more than something abstract and nebulous like mathematical percentages and numbers. It has a more powerful effect on the reader because I know the actual feeling of a ping pong ball slipping out of my hand, but I don't know how it feels to lose 15 number combinations.
That's why I like using literary devices like similes, metpahors, et al. It just makes writing more colorful and interesting. And Speed, I know you love using the literary device of of hyperbole.
However, if you like using the literal "number combinations" and nitpicking every minute detail, then that's cool, too. Just know that most people here aren't using the term "lottery balls" literally, so you don't always have to point out that we're ignorant.