As someone who is an admin on one site and a member at various levels on other Discourse sites, yes I often game the trust level as I seriously do not know how to use Discourse at a lower trust level anymore. I often forget the first time I post a new reply or topic at a new forum about the trust system and then run into the bot trying to teach me and I just want to play wack-a-bot.
Some users have noted/requested a central repository or passing of a token so that those with higher trust levels get the same level or at least a much higher level automatically on other sites.