Well you should definitely post scene news here since most members (including myself) are mostly interested in it. Also for the PS blog news, only post stuff that might interest people, for example most people don't care about the latest movies/music on PSN but do care about the latest games.
Also, "likes" and "reps" are two different things (imo). If 3 likes become 1 rep we might as well just remove the "like" system and increase the number of +Reps you can give, like barrybarryk mentioned. BTW since you can give as many likes as you want that might also be abused to get others reputation up.
Suggestion - Premium members should get a little "banner" under their name saying something "Premuim member" or "PS3news supporter" just as a little "thank-you" from the site.