Two things.... This hobby chooses you. Not the other way around. Also, if you could be the one doing the choosing, this is one of the cheapest hobbies in the world.
In a matter of fact I think your absolutely right. Not everybody can truly appreciate the art of flashlights no matter how much time you spend telling them. Also over the year I have checked out many other hobbies including the ones mentioned earlier in this thread (headphone, cars, survival gear, even pens) and they are fairly more expensive (depending on the hobby). Except for maybe pens but over time it will accumulate to a price of a flashlight.