If you look through the countless posts people have made throughout the years about it... that should sell you. There ARE negatives too. Such as some people not having proper hygiene. But that's obviously not everyone lol. I know this because I read through old posts. Here and on Fetlife.)
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There are events that should be closer to you. You'll still have to travel and spend lots of money but... maybe not as much. I can add to make it MORE worth it... you should travel to New York or wherever you like after NEST. Or just have fun checking out Philadelphia. Make it a big adventure! Also, there are hostiles you could stay in here to save you some money. Or split costs for hotels with others who are going here.
But... I don't understand why you keep bringing up the bondage aspect. Not everyone is into bondage. It's not like if you go to NEST or ANY BDSM event, that people are going to restrain you the minute you walk in the door. The motto for most everyone Into BDSM and/ or Tickling: SAFE, SANE, AND CONSENSUAL.
ALSO: You and I have talked at length about being shy. That, maybe you should try going out and talking to people in your area about it. A BDSM munch at least. If you haven't done that... I don't think you're ready to fly across the country to an event. You don't sound ready for it by making this post. Why spend all that money if, in your heart, you KNOW you're not ready. To me, it's like you're looking to be talked OUT of it, rather than be talked INTO it.
If you can't convince yourself you're ready... no one else can.