Maybe someone else has arrived at this conclusiom but i hadnt seen a post illustrating as much so here goes and ill keep it simple...
Cash attack damage against boss is equal to your visible attack stat + (attack SKILL x 10)...
Conclusion - skill value is multplied by ten and applied to your general attack stat...
Friend of mine confirmed the exact math and ive done the same on my account...calculating this will get much more difficult with prize modifiers taken into consideration, especially invisible ones...anyone else care to share their numbers and either challenge or support this math??
I would be led to believe that the application of the skill in this event would mirror the application in regular game play