User blog comment:SeddieFanatic/The Shipping Curse./@comment-2032682-20110409062835

It's because there has been so little actual evidence. Especially for Seddie. I mean this in the nicest way, but they've had iKiss as their only romantic moment, and they haven't had many friendship moments. The episode with Missy is probably the biggest there, and it was a while ago.

Creddie doesn't do it as much because there are multiple scenes where Freddie tells Carly that he likes/loves her, and they share in iSYL and iSPD as romantic moments as well as having a lot of friendship moments (example, iSell Penny Tees where they work together and leave Sam on her own).