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The Hackintosh crowd is negligible. Not enough numbers to interest Apple. We've been through this before. If you think the hackintosh community is large enough to concern Apple you're absolutely, positively, delusional. Apple is selling record numbers of Macs each quarter. They have little reason to change the current lineup if it's making them piles of money.
The only people I've seen belly-ache about no midrange desktop Macs are the geek contingent on Apple fansites. Not enough of you to matter.
You know, despite our disagreement on most things Apple (I'm far happier on my Thinkpad running Linux than I was on my MBP with Leopard), you're spot-on here. Most people just don't care about having a midpriced expandable minitower. The last time Apple bothered with that was the low-end single G5 in 2004--which flopped. Heck, I almost bought one, but saved up for the full-on dualie instead. Most average consumers just want it to work, and really don't care much past that.