The trophies are an interesting feature as they (somewhat) promote participation for some. However, they are also somewhat pointless because the top trophy is for like 500 likes, and that will be attained by most frequent posters within the first few months.
I personally don't think the Like System works very well for a site like this anyway because historically (from my perspective anyway) the likes mostly just promote division where one group of similar thinkers like all of their similar thinking friends' posts and the other group does the same. I believe the original intent when we put the system in place was to allow the less vocal posters a way to show their support of a post or appreciation for a post without having to quote the post and say "Totally agree!" and not much else, so it cut down on 'spammy' posts. I just don't think it has really worked that well, instead it encourages something of a popularity contest.
That's just my two cents though.