I chose the $2.99 price tag for a couple of reasons, but near the top of the list was the 70% royalty rate at Amazon. Prices below this are not eligible and therefore have the 35% royalty rate.
However, sometimes (as happened fairly recently with Bane of Souls) Amazon can itself lower the price (probably matching a lower price elsewhere). If this happened and the price got dropped to, say $2.89 that would save the customer $0.10 but more than halve my income per book.
In that situation I'd have to increase the price by the minimum unit (on Smashwords and Amazon) in order to re-enter, hopefully, the 70% bracket.
After the comedy I imagine that the trilogy will be priced a bit higher (probably looking at $4.99 per book, but that's not set in stone) and this shouldn't be an issue. I really dislike fiddling with prices, but because I selected the Journey to Altmortis price in order to fall within the higher royalty range that's something I would have to do, if the situation outlined above arose.
As for the comedy, pencilled in at 20-40,000 words, I'm also thinking of a $2.99 price tag. The aim is a Christmas release.