Wow, that's high! Is the security parachute included in the price? :p
To be a bit more serious, IMHO more than two levels would suffocate anyone who goes higher, not to mention during summer, when any 3+ levels would have +10°C room temperature so you can imagine that sauna.
Also, if let's say a couple decides to shag on the top floor, I bet the whole structure swings like in a boat! :D