I do still believe people should mine more at home. Did you guys read about the recent 'Compass Mining incident'? Users' gear was suddenly shut down and they had to sell their gear within 48 hours notice, because the company had issues with the Russian hosting provider. No chance of getting the gear home. I'm not against people building mining farms for themselves, but I'd try to have full control of my hardware at all times and not rent it to someone who might not let me have it back. But I digress, sorry for the off-topic.
The problem with this is that a lot of people would rather take that risk, which to be honest isn't exactly common, than pay the increasingly higher electricity rates at home. I'm assuming you mean by home, actually in their house, or even if you're referring to mining within their own country, if you're in the West, then you're very likely paying more for your electricity than you would in the East. So, naturally there's a lot more incentive to have
off shore if you will, mining operations.
Also, the other downside, and this only really applies to if you mean mining at their actual home is even the quietest miners, tend to make some sort of audible sound, which not everyone wants in their home. Then you have to think about the dynamics at home, the husband/wife might want to mine, but does their partner want the constant hum of the miners, and the wires sprawled everywhere.
I don't mine, so I don't know the exact logistics or the costs of hosting mining equipment over seas, but I can definitely see the pros in it.