So I searched around the Web about this, and it looks like this person can be suffering from compulsory hoarding. This is, basically, and addiction to collecting useless stuff in quantites that affect your quality of life (like filling your bath with rubbish so it casn't be used). Comparing with what some affected people do witht heir homes, hoarding bikes isn't even the worst, although I still hope that guy found help he need(s) (if it's still going on).