Can you really convert 10% of that sort of traffic though? I would have thought 1% would be ambitious. Quite prepared to be wrong though - I suppose if the relevant keywords are really strong then maybe it would perform higher.
It's a niche product and people who search for those keywords usually already know what it is and that they need it.
That's the beauty of organic search traffic.
When I did paid ads, in the other hand, the best I remember was 2% click rate, then 20% trial download, then 10% purchase. At those percentages, a $2 cpm will cost me $5 per acquisition for a $9.99 app, so I have little wriggle room before it becomes cash flow negative.
Interesting! How did you find a relevant domain with backlinks that were going to work for you? This is something I've looked into in the past, but discounted as I thought it wouldn't work, so would love to know more about how you did it...