[UncleOxidant]

There were Phi cards, but they were pricey and power hungry (at the time, now current GPU cards probably meet or exceed the Phi card's power consumption) for plugging into your home PC. A few years back there was a big fire sale on Phi cards - you could pick one up for like $200. But by then nobody cared.

[rbanffy]

Imagine if they were sold at cost in the beginning. Also, think about having one as the only CPU rather than a card.