I think the crack-out game is understandable if you have a coin YOU LIKE..and you think it's undergraded and re-submit....but that's different than deliberately going after coins you intend to sell solely because you think they are undergraded.
For veterans and experts like yourself, maybe a niche sector can be exploited, Zad. Clearly, alot of coins -- including Saints and Indian Heads -- were undergraded when they were raw and without a TPG holder in the 1970's,1980's, 1990's and early 2000's. Especially high-end coins found at auctions. David Akers used to find coins 2-3 grades too low that were given by dealers or the estates.