For me the pricing model is perfect for something like this. $2.99? thats right in my 'don't even think about it' impulse range. $5.99 for additional features? I'm already paying $2.99, its not much more AND I get more stuff. Bravo!
i heard an axiom once re: pricing that you want customers to be begrudgingly, but willingly, paying you. that's when you know you're charging enough :)
either way - thanks!
<Insert standard "this may not apply to everyone but is an interesting datapoint" caveat here>