This is easy to explain actually.
Like any fetish community, we have our collection of fairly well-adjusted people and our...well, socially awkward shut-ins. Now, having a tickling fetish didn't MAKE them shut-ins, but it didn't help what must have been an already unpleasant lifetime.
When the TMF and fetish networking came available, both sides were able to interact with each other. As time went on, the well-adjusted people managed to grow and change, and find the happy balance of tickling in their lives and communication. They were able to mix tickling and their regular daily life in equal measure, more or less successfully; they didn't NEED to talk tickling 24-7 and were able to enjoy tickling in a variety of ways.
The OTHER group never enjoyed this and as a result, had a WHOLE LOTTA TIME to flood the forum with a lot of discussions about tickling that are the fetish equivalent to keeping a handful of naked teenagers in a pit in the basement. Therefore, while the rest of us spend our time living life and writing about silly stuff when we're on the forum, the others tend to dominate the forum with constant discussions about feet, armpits and other ritualistic, totemic interests of "tickling as torture only" and pouring over clips by video producers that have a kidnapping/non-con feel to them; producers keep making them because they sell.
The good news is that there's a lot of media (mostly fiction) out there that focuses on the fun aspects of tickling, you just have to sift through it. I recommend starting with the works from MTJ Publishing and Agencies; they also use the torture-related stuff, but the work is also pretty varied, more so than what you'll find in the free archives here.
Not to sound like a broken record or shameless shill, but one of the BEST consensual tickling clips ever made is the classic "Erin Loves to be Tickle Tortured" video by Yaqisworld; another is the extremely-intense-tickling-as-delicious-fun video "Symphony of Laughs" by the Evil Ticklers. The Jordan clips from jpbfc and a number of clips from Boston Tickling are equally good and focus on the playful back-and-forth between playmates.
If you're interested, you can find these things here:
http://www.clips4sale.com/2507
http://clips4sale.com/store/510 or
http://www.clips4sale.com/studio/4130
http://www.clips4sale.com/38230
http://www.jpbfc.com/public/CD-Video/DownloadClips/CatalogMain.php?Modelname=Jordan&Theme=all (I recommend "Tickling Chairfixed" series)
And one of the most criminally underrated "torture as fun" producers is Knismo of
http://www.clips4sale.com/studio/2152
So NO, you are NOT weird. In fact, feeling weird about it is what often drives most of the socially awkward people further and further into their shut-inness until their interests become nothing more than a release behavior and has no intimate/interpersonal connection whatsoever. You just have to develop a more discerning eye.