I have operated and/or currently operate the following pins:
MM, TAF, BDK, POTC, WOZ, WW, BK2K, JB, Shadow, WH20, LOTR, BSD, Mousin Around, IM, JM, Taxi, CFTBL, Flintstones, FT, NGG, Diner, South Park, WCS94
Some pins earn slightly more but are a constant pain to keep running or keep clean, some require little upkeep but don't earn as well. From the games I've operated, I would pick the following 5 as the consistently best combinations of earnings, reliability, and ease of maintenance: