I don't understand why someone needs more then 10 mbps.I still don't understand why someone would need a 300mbit connection in your home. Maybe for the fools running torrents and stuff all the time for pirated movies.
Unfortunately now in this day, it's all about the monthly cap, not the speed. As with most providers speeds you could blow through your cap in a few days running at 100% of your speed.
I've got 4 hard wired items in my router, as well as 8 wireless items, and yet to have a speed issue. We netflix and do online gaming, anything atleast a normal house would do. Never an issue yet.