Im not convinced thats really the case tho pestillence (extra spend). Most players who come to the HW centre are young and have a fixed spend limit. A lot of them are teens/ early 20's and don't have credit cards so when they've spent their £30 or whatever on paint thats it, they're finished for the day.
What you see a lot players doing is rationing their paint so they only take a hopper full or a hopper and a pot (or in some cases 50 paintballs!) out per game.
Marshals don't carry extra paint to sell to players on the field in the way that many companies do, nor do we operate a 'tab', so there are no nasty paint bill surprises at the end of the day. Players decide how much paint to take out with them per game and when they've shot it that's it.
Sure in a few cases such as stag do's, works outings etc when players are out for a special occasion and the skys the limit they will spend more if they have a credit card, but thats their choice! They come to play paintball and we provide the opportunity to play for as long as possible, rather than stand watching in the dead box