Hi Steve, I'm a long-time fan of your site and would definitely attend as Vegas is only a hop, skip, and a jump for me and I go there about once a month anyway to party and gamble it up. Anything around your proposed price range is a huge bargain and I'm degenerate enough that the casinos put me up for free so hotel is no problem
I agree with most of what others have said as far as I think the content should mostly be geared towards those who have taken the time to become familiar with your previous work.
Having said that, although I initially found your site when researching sleep issues, I stayed because I found the articles re: raising consciousness, becoming more courageous, finding your real purpose, etc. very inspirational. Hearing a talented speaker (which I know you are from listening to your podcasts) cover and expand on these type of topics as well as provide further insights would be awesome.
This site was also my first introduction into IM and LOA and would love to have more discussion and exercises to practice that may help this process. Basically, I know you can't please all camps and expect you would go with more of the "classic" Pavlina-type subject matter, but I think a little time to cover your views on the LOA and IM and additional insights on how to implement it into your life will help even the most "practical" minded members in all areas of their life. As your audience for IM-type material is likely much smaller, you may want to consider different price structures for different lectures or days so those who aren't interested in one area would only have to pay for what they are interested in.