Approximately how much money do you spend on your hobby in an average month? ~

Maybe $300-$400?  My hobby is eating.

Around $30.  My hobby is meteorology.

Nothing. I gave all of my coin collections to my children.

Depending where I'm shopping...Shoes can cost any amount up to £ 2000 or more.im not saying ic actually pay all that for them...:) 

$200 for internet service at home, at work and on cell phone.

Depends on the Season

Skiing 4 weekends in a month, 4 months in a season at 30€ per time, so 120€

Running 3 month life span on a pair of 190€ = 63€ a month.  I would never amortize running clothes since that stuff lasts years.  Oldest pair of running shorts in 15 y/o

Biking hard to estimate, same goes for hiking and working out.  Are those hobbies or necessities is the question.

Since I no longer chase women my monthly cost for that Hobby zero.  Now Partner maintenance cost hard to determine since she pays her own way and we invest most of what we make.  Are the kids and dogs a Hobby, desire or necessity will not try and answer tht one