Even better: access to use third party apps is a second tier that costs $10, and give $1 to the app maker. All the incentives are nicely lined up: the user won't choose to pay more if it's not worth it so the alternative app is guaranteed to offer some added value, the app maker gets paid for their efforts and is inclined to closely follow Twitter's increased rate of feature development so at least they don't fall behind and ideally innovate, Twitter gets value in not just a bit of extra money but also platform interaction experimentation which they can mine for good ideas to integrate back into the official client, they're inclined to make the API good, etc. I don't know how most people would take to this idea, but I like solutions where the incentives are all aligned. Am I missing something?