well TS
maybe your friend has no commitments in life yet.
thus he can spend on whatever he deems like doing.
as a friend, you can try to talk with him about it.
As for myself, usually i only go for 1 massage n 1 ktv a month
sometimes even like 2 months a time.
even including tarbaos n such i think i spend less than 500 a month on such activities.