It can be a nice idea. However, imagine that the predictive text will cost €10 and the full license €50, then many people will buy the €10 instead of €50. On the other side, if the price policy would be €40 and €50, it will be a small change and probably many will still buy the full license just in case one day they might need an Android app. The license price is tailored for companies more than end-users which are an insignificant profit source, IMHO. I wrote many times, that we are just beta-testers, here.