Ugh.... Damn it Apple...

This has nothing to do with Pricing or "PRINCIPAL".

This is all about the monster that Apple has created with their broken pricing model/facility has generated over 100 million overly "entitled" users.

As the developer of a "Free" application I can assure you that this same sense of entitlement exists in that arena as well.

Your argument makes NONSENSE.

You are not entitled to anything other than what is guaranteed in the contract between you and the developer/company.

He has every right to cash in again on a better implementation and new features to a twitter client.

You are entitled to one thing: your choice "to" or "not to" buy the app.