$15 to upgrade a $20 application? Seems more like a repurchase than an upgrade. Even DiskWarrior's ridiculous upgrade fee is only 50% of the purchase price. Charging 75% of the purchase price to "upgrade" seems more like taking advantage of loyal users rather than thanking them for their continued support.

PasswordWallet 4 would have to do something pretty stupendous for me to justify the upgrade. I've yet to read anything to suggest that it does.