When we want games, we just want them, publishers be damned. Games like Electroplankton bother us because they're so hard to find, and even when Electroplankton was available way back when, it was only available online and at the Nintendo World Store. We never stopped to think that maybe retailers refused to put the game on their shelves. (Note: We're not saying that this was the case with Electroplankton, only that it may have factored into Nintendo's decision).
MTV Multiplayer's interview with Christian Svensson, the Senior Director of Strategic Planning & Research for Capcom, brings some of these issues to light. Svensson talks a lot about the first Phoenix Wright game specifically, and how it was difficult to convince retailers to stock the title despite fan interest.
There are also many other issues that come into play, like first week sales and production speeds. If companies can't provide retailers with games almost immediately after orders are placed, stores will just move on to the next hot title on the market. This makes proper estimates for DS games especially important, since they take about two months to manufacture. No pressure.
The article is definitely worth a read, and the next time you find yourself irritated because so-and-so game is impossible to find, you might be a little less quick to yell out objections.