All these likes and trophies and what not are kinda Facebooky if you ask me.
I actually agree, and both like and dislike them as a result.
The good: On the old website, without the "like" button, threads would often be interrupted by many posts saying "well said" and "I wish I could click a 'like' button on that" etc. This was distracting in my opinion. Having a 'like' button means people can express agreement without diluting the content of the discussion through a proliferation of short posts.
The bad: But having a "like" button, in practice, means that many people just click it so often it becomes near meaningless, so that when someone really did "like" something they post such an additional message anyway...
I have set it up to be a useful tool for moderators. I have set certain restrictions for new signups, that are lifted once you are obviously a "real" person. One of the basket of measures I have used is whether a person has received a certain (small) number of "likes". As bots and obvious spammers / scammers won't receive "likes", they are therefore weeded out with these rules. This is helpful as it means there are some very basic levels of protection for real members that are completely automated and will function even if mods are unavailable.
A "like" button does help to increase engagement with the forum. That's why Facebook is successful - people get more engaged partly because they got a notification that someone liked what they said, so they feel more socially included and spend more time on the site. It's subconscious. But I don't like that also, because we should not be looking for social approval, but rather the approval of God. There is a risk that people will become too attached to the "likes" feature, watch who has liked their posts, and get upset when they say something that they felt was important to them and it did not receive any social approval. This has the potential to be harmful psychologically, and Facebook is a prime example of that. Because we need to be willing to say what we believe even when everyone disagrees, and this has the potential to subtly push against people's willingness to do that.
So I hear you Cap, I really do. I don't know what the solution is. An argument can be made either way. So long as we all take it as a bit of fun it should be harmless, and can be useful - but we must be careful that people don't become too focussed on social recognition.
It is possible to add an add-on to Xenforo that would allow us to restrict the number of "likes" a person can give out each day. That could potentially allow the feature to remain more sincere and therefore useful, and minimise the proliferation of "likes" and resultant psychological engineering that is the problem with Facebook.