Most teams pool paint. Which is fine if you are the back guy who says he can "lay the paint", then shoots a hopper and 5 pods at bunkers and hits nobody.
And yes, you would be expected to pay the entry fee, unless you are a well known player - that is, CPPS Elite Divsion level - who is helping the team out.
So I would say you should budget around £200 if you don't have a paint support deal. This should cover you for entry and pooled paint for a training day and a day's play. If you factor in travel, food & hotel, you are looking at more like £300.