While I can get behind the general sentiment of this (marketing towards the people who will make the purchase) - I think it overlooks one unique problem with teachers: traditionally they don't have money for purchases like this. My wife is a teacher in a fairly good school district - and she was only given $100 for all of her purchases for the whole year (paper, supplies, etc.) We have an iPad that she occasionally uses in the classroom... and even with the relatively cheap apps (<$5 range) - she sometimes second guesses purchases and is quite hesitant to buy an app.
I just think the primary and secondary school system is a very rough market to target a paid app/software towards.
I just think the primary and secondary school system is a very rough market to target a paid app/software towards.