I think the presence of meta-gaming is inevitable in the leagues, I just didn't realize the extent. Going into the league, I figured I'd probably make considerations of how to proceed based on how the league was playing out (who was winning/losing), but I didn't realize there would be blatant conversations about it, which is more of a reflection of my ignorance than anything else, and I have since modified my approach to the topic. Anyway, in game four of our league I was a bit surprised when one other player told me he had been lying to me for several seasons (in game four) and never even considered working with me (in game four) based on the league standings... One player in our league makes a habit of repeated, lengthy and over-elaborate lies ever game, so I kind of figured that was an anomaly (and/or not related to metagaming), but the admission of this second guy finally got me to wake up and realize how embedded metagaming is in league play...
As far as metagaming in league play, I can understand how that is an acceptable and/or inevitable part of the league, but it has been suggested to me by a very highly ranked player (not someone in my league), that there is a bit of a "good ol' boy" network on this site. He suggested that some of the people that have been around longer have a tendancy to gang up on newer players that tend to be a bit "too" aggressive and, because of this form of metagaming, he had to adjust his style of play for this website if he did not want to be repeatedly ganged up on. That also took me a bit by surprise, but again, my ignorance is hard to hide on these matters... and, Edi, I'm not just talking about cases when two people team up and get an early lead!! ;-)
I'm not exactly sure what the whole purism question really means, but if you scoff at the metagame, as is/was my tendency, don't be too surprised if/when you get eliminated quickly!!