Businesses of a different industry can use the same name. There is nothing keeping you from using the website for blogging. The computer store might be problematic if it could be construed you are trying to profit from EA’s established trademark. Also, why would you want a .org for a storefront? I’d say get a different domain for your computer store.
I see this a lot too. Based on where I live, I’ve assumed it’s bc there are too many people living in the house and they need some peace and quiet and/or talk on the phone in private. It’s common to see 6+ cars in front of 3 bedroom houses here, housing prices being what they are.