Very few sites I've come across will let you use your own marker against punters, ones I've been to have had 2-3 walkons on each team acting as squad leaders to encourage players to move in the right direction. In addition, head shots and gun shots didn't count for punters but do for the walkons, to help balance skill levels.
Alternatively, the sites may not let you use your marker, but could well be happy for you to use your own clothing, mask and loader. Possibly air tank too, but depends on the site. Tippman 98's with a decent loader and a clean barrel aren't too bad at all.
Bit of a slow reply but hope it helps!