I'm new, barely two months and 67 caches into this wonderfully fun sport/obsession/game. I've fallen in love with finding and moving trackables, invested in a few to put in caches, and watched anxiously to see if they go somewhere. Oh, they went somewhere, alright, but I have no idea where. I've scoured logs and the forum posts to find out what's going on, and I reached a conclusion: not everyone is playing by the same rules.
The most prominent alternative game appears to be "Finders Keepers; Losers Weepers". It seems that to these players the objective is to get to a newly placed coin and claim it for themselves, thinking that perhaps the game is about finding and collecting trackables. I can't really blame them, coins are very tempting and I resist the urge to collect them myself. I still want to know who has my coins, though.
Another variant are the players who play under the radar. They may play the same game as I, but they avoid logging their thousands of finds on the computer. They sign the log, but refuse to do any additional tracking. This may account for trackables that just show up somewhere other than the cache they were put in. I don't think there is really anything wrong with what these minimalist are doing, but it sure plays havoc in tracking a coin. There is no rule that requires one to log a find in the computer, that I've found anyway. It would be interesting if someone who owns a cache would compare the log entries with the computer logging.
These two variations have altered my future in geocaching. I will not, even though I want to so badly, be buying or placing trackables in caches. This will really take the sparkle out of the game for me, but what else can I do. Next, now that I know how useless the computer tracking can be in following a coin or cache, I'm demoting the logs in importance, credulence and priority.
Being new, I probably haven't stumbled on all the obscure variations yet. If you have found others, please clue me in.