Think of your fresh CPL as an apprenticeship, you wouldn't dig trenches for FREE as an apprentice plumber just to "build experience".
And that's what a job like skydiving is. It's like digging a ditch, great experience for the first month or three, but by then you have it pretty down pat and if you are working for a smaller drop zone with only a C206 or C182 there's no where to move up to. It's an awesome job and it allows you to build a variety of skills but it's very similar every day. They might be doing you a favour in the first month but after that you should be a highly competent jump pilot and deserving of some money for the loads.
If it really is a club, and NO ONE is getting paid, instructors, tandem master, CI etc. then fair enough. But otherwise, you should be compensated.