I start out with 3, $1 bills...and have had some get almost downright frantic when I keep adding to the pile as they find more chips. I have been known to get all the cage gals at the Gold Coast (and several other casinos) to ALL start digging through their drawers to help me complete a set, etc....especially when I have 10+ chips and now I'm adding a $5 bill, etc.
Even with the $3 to start, I have had the gals at the Riviera dig through the LE drawer and back room for 10 or 15 minutes, only to come up with nothing (my collection is pretty complete)....I still thanked them for their time and effort, and give them the $3....talk about getting a shocked look!
The funny part was, I walked into the Riviera 3 months later and they remembered me. One gal was already opening the LE drawer before I even asked.