It's crazy how they're all over 10,000 already with no high roller. Now it's easy to tell the bots from actual people. I haven't even been playing lately because of this. :
Idlers - PROK
Transition Carrying Idler | Rocktech Zambia
Belt Conveyor Galvanized Stainless Steel Friction Roller for Quarry - China Friction Roller, Stainless Steel Roller | Made-in-China.com