Before I comment, I want to talk about another thing....I think a lot of people don't understand, that they already have a STB in their home....that box that the cable company put on top of your TV so you could get pay-per-view and other premium channels....
STB....
the Personal Digital Video recorder, like TiVO,
STB....
So first, the market for STB's is proven and viable and has existed for years.
OK, now to your point
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The low end has fierce competition by established players, including vtech and samsung....so if you are entering the market, it makes sense, fight for the high end, thats were margins are, and thats where you have a chance on a lower volume run.
You have to distinguish yourself somehow, why not as the most powerful solution? The g3/600 is a high end STB chip, but its a very low end desktop chip, and the pegasos may be expensive to Amigan's right now, but it is not extremely expensive to produce, having all low end parts as it does.....
So...from a manufacturers perspective, they may see value in this high end stb/very low end desktop...the bundled os, and other matters may make it appear attractive.
why would someone need the high end? hmmm, dunno, why does the market always advance....bet you the low end integrated STB's two years from now, are as powerful as the g3/600 is today...the market always advances...I'm sure someone will think of a reason to use the extra power, they always do.