Graffiti is stupid. We have it on all of our benches, tables, baskets, etc... including comments and drawings about illegal activities that bring attention I simply don't want around any bench or table I'm sitting at on a daily basis. I don't even tag baskets when I hit aces, I only mark my discs. I've gotten 7 so far, not marked a single basket. Only time I ever marked anything on a course was something that said "If you cannot respect the course, do not come out here" after a bunch of graffiti was drawn on a table that was JUST repainted.
That said, I've never seen any sort of charger around any of the courses I've played lately.