I currently have four 7 gallon, one 8 gallon, one 15 gallon and a 3 gallon in my bedroom. There's also an empty 46 gallon sitting on the floor. I still have to go buy an industrial grade shelving unit, but eventually I will have eight 3 gallon tanks, my 46 gallon tank (set up with a group or pair of wilds) and two 15 gallon tanks in my bedroom. My older brother is an electrician and is installing two new power points because everything in my room is run off adapters.
I would love to have a complete fish room, but I would be worried our floor would collapse under all that weight since we're not on a slab. Humidity is also a real issue. My room is so much hotter than anywhere else in the house so I have to sleep with my window open if I shut my door at night.
Not to mention electricity and water costs ... eek!