I have been prepping since 1983. I was still on active duty and that was a problem. The Navy spent a ton on training me and others like me.
When I retired in 1997 I started the physical part of prepping (buying stuff.) From 1997 to 2010 my prepping expenditures were 90 % on material items (guns, ammo, food, etc etc.) The 10% remaining was spent on going to “events” of physical type.
In my group of preppers we train each other. There is no cost involved unless it is food or more ammo to replace what we shot.