In all the hobbies you can't count the initial cost of the main item (Guns, bikes, etc) as part of the total cost per use unless you use that item one time.
A nice gun can last your lifetime but figure it for 20 years and the per use cost drops dramatically. I don't know how long a $2000 bike lasts or even the wheels/tires but the per use price also drops dramatically.
My golf clubs cost $1000 when I purchased them new in 2000 and are still perfect 15 years later and I doubt I'll replace them in my lifetime. Per use is peanuts.
So, when figuring the true cost of a hobby, once you get past the main expense you just look at what it takes to get you thru that particular use (ammo, green fees, tags, golf balls, entry fees, gas, etc). While still not cheap it doesn't really cost a lot more than a nice dinner with the wife at the local steak house and is usually a lot cheaper,