Which is my point, this is well over an order of magnitude more expensive than what the 1Gb consumer switches people would buy for home use.

Well, I suppose it depends on what you mean by 'affordable'. 10G is now affordable for small businesses, when up until recently it was strictly the domain of the large datacenter. I wouldn't put it in my house yet, but I see no reason to assume that 10G copper switches won't get to that price point eventually.

you must factor in the sfp+ module, around $200. So a complete port would be $350, $700 for a point to point link. Thunderbolt is cheaper

No, that switch is 10G copper, no sfp+ required. Thunderbolt and 10G ethernet aren't really competing in the same space, so I'm not sure why you brought it up.