I mentioned in a different thread but sometimes the best answers are the simpliest! I don't know how just hitting a "like" would affect Sherdog database, but like you said, just stop tracking them at this point, we didn't used to track it.
Give us the ability to "ping" the poster with a like letting him/her know we liked it and the clear it from the database once the user either acknowledges the like or after X amount of days.....maybe 7 days purge the database entry for that like tag. Surely that can't tax the the database that much.
I don't care about likes vs posts or how many likes a person has . But I kind of like to log into Sherdog and see if anyone liked what I posted or who liked it. It doesn't validate me but it gives us a sense of community in a way. If the same people like your stuff a lot and you tend to like there stuff and pretty soon you kind of build a friendship.