Can I double the fees of accreditation in a holistic arena that historically feels they can charge only $100 year?

If your product is truly better undercutting the undercutter is a good temporary marketing strategy. Just make sure your business can afford to do so. Their business model might allow them to simply charge less because of efficiency factors that you might have. Or your prices might simply be a bit higher for what your market is willing to pay or considers justified.

STOP!!! DON'T DO IT. GO GET A REAL JOB!! PLEASE! You don't plan to be a consultant. You become a consultant because the experience and wisdom you have is so obvious that those around you are eager to pay you for your insight. It's a calling -- not a job. Giving your "business advice" to a startup is like telling a 2-year-old to go "poo poo in th potty" -- anyone can do it. You just have to be a little bit more sophisticated than a baby. To service people who have money (and who are serious about how they spend that money) you need to take you game to a whole new level. I suggest you intern or partner with an amazing consultant who does this already. Learn. Do the gritty work that no one else is wiling to do. Everyone is a coach. Right? Drink a beer on game day and you supposedly know more than than the dude on the sidelines with the clipboard. But is that "really" the case? Of course not... DON'T BE A COACH. BE A LEADER.

If you mean the conversion rate is the same (meaning you're making a lot more revenue with the larger price), then that's the right call. If you mean that your net profit is the same but you have higher unit sales on the first price I would go for the lower price to have more customers (and more chances to have them buy an IAP eventually, or leave a good review).

For me personally, no. However, what you really need is a larger data set. Gumroad just did a post on prices ending in "9": http://blog.gumroad.com/post/64417917582/a-penny-saved-psychological-pricing 37signals started with prices that ended in 9: http://37signals.com/svn/posts/1287-ask-37signals-how-did-you-come-up-with-pricing-for-your-products ... but they later did research and found it didn't matter (for them). The answer for YOU will likely be to test these things for yourself on your SaaS app.

Are you the manufacturer or reseller? If you are the reseller, typically about 40-50% above cost. Use the MSRP as an indicator.