A 15gig file would only take 2 minutes anyway, if you need it in a minute, set up teaming. Although if you're using Windows Home Server, you'll be limited to single disk speeds, which would be about 120MB/s sequential anyway...
The cost per port is also about 20x higher than gigabit. This doesn't make sense on any level. Unless you really need more than 4gbit (500MB/s!) then you're better served by teaming gigabit ports.
Still, if you really want to waste your money, please do and then report back
Edit: Also many of the 8-port 10Gbit switches I've played with fail to switch at full speed to all ports. I think the worst crapped out at about 5Gbit/s per port, highest I've seen for anything under £3,000 is 8Gbit/s. Obviously these kind of prices are nothing compared to high-end kit.