Man, remember when they put the best rare in a set in a Precon? I remember checking Target every day to see if they had more Rat's Nests in stock.
Man, Wizards made several mistakes at once with that... for one, they made some last minute changes to the card and didn't get to playtest them (hello, Skullclamp!), and it had some ridiculous versatility for a cutthroat price; the second mistake was putting it into a precon, since Jitte was more expensive than the precon it came in! Cue thousands of players and stores gutting the deck.
The whole issue about Wizards not adding chase rares to intro and event decks isn't really a problem, since they aren't meant to offer more monetary value than their MSRP in singles. Reading MTGSalvation makes each set look like it's the second coming of Mercadian Masques (sort of reminds me of that Miyamoto "Now you love Wind Waker" image), and all theme decks are labeled as awful.
If they were good, it'd probably be the whole Rat's Nest thing all over again, with speculators hoarding them, stores gutting their product and people who wanted the deck to play it being unable to get one. Event decks tend to be more spike-friendly, but still not so much.
The Simic Event deck could be just what I'm looking for to get a few blue and green cards for my base-simic deck, since for now it's more like base golgari with a splash of blue. I really want to dismantle my GBw goodstuff deck, since it was a bit too powerful for my FNM despite being a homebrew build I came up with and tweaked myself, and also because I want to play simic now that there're more cards that support the color combination.