Im going on tour and was looking to post an ad on the vegas board and noticed there wasn't an option for NV or Vegas. Anyone know why? Any suggestions on where else I can post an ad besides Eros?

You need to look again.  There is a Las Vegas ad board.  It’s been on TER for like forever.  

Is it even possible that on a hooker / john site, that a Vegas board might not exist ?  

On the Vegas site, I would go the the "New Thread" and just ad your post, attach a website or ad to your post..I think that's the way to do it.
By the way.....Hey stranger, finally going back, huh...lol

I know right, I’ve used it before.  
Not sure what happened when I looked yesterday maybe because it was from my phone so I just couldn’t see it as well😜 but found it! Thx