2.99 doesn't hit my sweet-spot. And I realised that the price has stopped me from investigating the app further, to see what premium features it may offer.
You need massive volume (like advertising) to make this model work--it's just not there.
Making the app paid lets me keep the service running for the few people who think it's valuable enough to pay for.
This is a better solution I think than shutting down the service all together.
I'm definitely considering an ad-supported or free version, but wanted to start with a paid version first.