How is THAT Fun?

When does a hobby become an obsession? My husband's "hobby" of mountain biking is quickly getting to be an obsession... For instance, yesterday he went to the local bike to by a new spoke for one of his wheels... a spoke is a $1 item just in case you did not know... and he came back with this...

Yes, that folks is a high-powered head lamp for NIGHT riding... riding at night on a mountain bike in the woods... in the dark... alone... going up hills and down inclines... and he WANTS to do this! For fun! Again, when does a hobby become an obsession? I won't even go into the one high-dollar racing tire he bought to go with his high-dollar light for his helmet...