Costs? Well, I'm into PCP and from the sounds of it, on the cheap!
Tank - $350
Marauder - Pump Combo was something like $450
Fills on the tank are $5 at the Paintball shop, and gives me about a dozen fills on the gun
Pellets are $.02 or so each for good quality JSB pellets.
Range fees at local outdoor (75 yard) range is only $5 or the local indoor ranges are typically $12 (25 yards). Not bad for a good day out doing something I enjoy.
Granted a break barrel would be under $500, and pellets would be the only extra cost, but I like the PCP's!
Now, if it was a powder burner, (really can't afford one of these! ) a good long range gun for bench would be $1000 (on the cheap) or more like $2000 by the time you kit it out
Ammunition would be at least $1.00 or up to $5.00 per round. Reloading gear would be a must. Disposables would be a constant expense!
Shooting longer ranges requires a two hour drive to a 1,000 range south of where I live
Lets not even talk about Dutch Oven cooking, wood shop tools, metal shops, cameras, computers, and other things you can get into.
Makes having air gunning as a hobby all that more reasonable priced!