Personally I think BYOP events should take a lesson from restaurants and have a "corking fee" or whatever it is called when you bring your own wine for an event. You still supply it but they effectively charge you their markup anyways. So it would allow you to bring your own paint but you would have to pay $X per case for any you brought in.
"Sometimes the point of doing something is not to find the "best" way of doing it, but to discover the most fun" - Gever Tulley
"Use peaceful means where they are appropriate; but where they are not appropriate, do not hesitate to resort to more forceful" Thupten Gyatso (the Dalai Lama, 1932)
"It is not the will to win that matters - everyone has that. It's the will to prepare to win that matters" Coach Paul 'Bear' Bryant.
"The ink of scholars is more precious than the blood of martyrs" - Muhammed