You know, part of the thrill in gifs/ponies is the feeling that you're not supposed to be doing it. You know, you're not supposed to be all up in there. You find something you want to get in and you get yourself all ready, find something you really like and take the plunge. You don't know what the reaction will be because its completely unexpected, you're not even sure if what you brought to the party is going to fit but then you just do it and pray that its enjoyed.
Now when there are threads out there begging to get gifed/ponied I mean, they aren't all that attractive. The thrill of the hunt isn't there, it's already been done hundreds of times by the time you get in there and its just not pleasurable. Those are dirty, nasty threads and should be avoided.