I'm thinking of joining the revolution and I have multiple tv's and am wondering if a need a seperate Roku device for each one or just swap out when not watching and move the device?
yes you can get away with just one.
myself,i would at least get HDMI cables for each tv so i wouldn't have to go to back of the tv each time,but that's up to you.
If you go with roku stick, add a hdmi coupler to the end of the suggested hdmi so you can attach the stick to the hdmi cable end.
Holy smoly... 9 TV? You can get away with just one but you may also want to look at the soundbar which has a roku device built-in, although that's more harder to move from around.