it says that there are a plethora of abandoned buildings and that they are easily accessible.
i havent seen anyone else do this. so im not sure how its "wannabe." the only thing that came close to this was in the early/mid 1900's by a photographer painting abandoned home interiors. i cannot remember his name off the top of my head.
as for the people suspending. it has nothing to do with crucifying anyone. from what i know and understand some do it because they like to push their bodies to the next level. some have spiritual thing happen. some just do it to try it. some do it just for the performance aspect [[concerts, haunted houses, and so on). some like the adrenaline and endorphin rush. and im sure there a many other reasons.
as you said "I am maybe not awake enough to see" maybe you just need to open your eyes a little and see, experience, and/or understand that people do what makes them happy.