WPM is right, on some level, that because PUI/POP never releases the information about what is in the set, they did give birth to the "stink" that M_Liesik speaks of. If POP/PUI would have posted a simple checklist for the set, or told what cards would NOT be in the set, this whole problem would not have happened in the first place.
We provide the information when the set is officially released, not before. Prereleases are SUPPOSED to be exciting because people can see the cards, and what's in the set for the first time. The buzz on the first prerelease weekend with people posting what cards they found, and pulling the set list together USED to be exciting, and fun. With full spoilers or set lists out ahead of time, now its not as much about "Holy cow! Look at that card! That's so awesome!" and more about "Oh good, I got that card."
Let's use movies as an example:
When you go to see a movie, it is preceeded by previews for upcoming movies. The goal of a movie preview is to get you excited about seeing that movie so that you want to go spend your money on that movie when it comes out. The preview only shows you small segments of the movie to keep you guessing about what happens.
Now, imagine if you were to go online a week before the movie comes out find out every single thing that happens in that movie. How likely are you to want to go see it? You may still go see the movie, because you want to see those things happening. Or, you might just decide "well, I already know what's going to happen, so I'm just gonna save my $10."
Why would any business ever want a customer to do that? I mean, the movie could be great, the movie could be terrible. But the company that shelled out millions of dollars to produce it would really appreciate it if you had some sort of motivation to give them a return on that investment. A little teaser of what's in the movie leads to far more interest than spoiling the entire thing.
While the example may not exactly apply to the PTCG, it's close enough that you can garner a little insight into PUI's thought process.