One reason probably is because it's a consumer computer and most people who would buy it wouldn't upgrade it or don't like messing around with the inside of a computer. Another reason could be that Apple wants you to keep buying new computers so they make more money.
they don't solder a card onto the motherboard; they build a chip set into the motherboard because it's cheaper for them and they need all the space they can get in that tight enclosure, especially without a fan. A 'card' would use a lot more power. Steve doesn't like that.
Because the iMac design wouldn't fit an upgrade card anyway. There's a dearth of developers making normal PCI and AGP upgrade cards for Macs as it is...there's not much of a chance they'd make a special card that would fit some proprietary physical size spec needed in an iMac.
WHy did people buy PC cards and not the MicroConversions cards? They were simply too expensive. The same ones with the Mezzanine Voodoo2 card they made. Not enough people wanted them, and they weren't really worth it. Voodoo2 cards still required passthrough cables, remember? Anyway, MicroConversions went bankrupt because making upgade cards for proprietary specs isn't lucrative.
[quote]Originally posted by Eugene:
<strong>Because the iMac design wouldn't fit an upgrade card anyway. There's a dearth of developers making normal PCI and AGP upgrade cards for Macs as it is...there's not much of a chance they'd make a special card that would fit some proprietary physical size spec needed in an iMac.</strong><hr></blockquote>
that's not true. if apple wanted to they could easily implement a 7 inch AGP slot into the iMac design. I mean even the 20th anniversray mac had a 7 inch PCI slot in it.
the reason(s) likey is
1.) Steve Jobs thinks the imac should offer everything out of the box and should never need to be opened. this is why there is no internal expansion on the first mac
2.) by keeping the imac feature set closed and not open to changes by the user developers know what they have to use use and meet the requirements of.