Having a 1gbps network would let you run more of your hardware at home where it's cheaper. This makes sense for certain specific cases.
For startups that need this power, hosting at home can save money. Also you can't beat the security of having physical access and control of your hardware.
For my app streamjoy.tv I run all the intensive tasks on a core i7 at home and then just push the rendered results to a $5 a month digital ocean vps.
For the kind of computation that I am doing it is much less expensive and faster to use my local hardware and push static pages to my nginx server at digital ocean.
If I had a 1gbps connection I would run even more of my setup at home. Its not that important for the features I have coded so far but in the future it would be helpful.