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Sell it for $100:
1) X number of people will buy it, but it probably won't be that many.
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Sell it for $0.99:
1) Many people will buy it
2) Many people will know your name & become interested in your work and future work
3) You'll gather a much bigger following, transfer this to Twitter, Facebook, etc.
4) When your next ebook comes out, all the people who liked this one will buy the next one in addition to new people, meaning second e-book sales will be much higher (if this one is successful)
5) Lots of sales = possibility of speaking engagements, further validating you in your field.
6) You might make less money (I'm guessing you'd make more this way), but you make so much more in other benefits.
The benefits for not selling at $99 just seem too high to me. I'd rather have 10,000 people read my book at $0.99 than 100 people read my book at $99. I'd even rather 5,000 people read it at $0.99 (making half the money), because that means you have 5,000 more people interested in what you do for your next ebook.
Good luck!