I sometimes read changelogs. Having them always present is just good practice and means that when I want to know what has changed my curiosity is satisfied - not having them available means I'm left frustrated and annoyed/concerned by the broken process, as changelogs are the norm on other related platforms (Debian, Ubuntu etc.).

I too would also tend to steer clear of applications where the developer(s) are too lazy and/or too unprofessional to maintain a list of the changes - a changelog is not an indication of quality, but it does at least suggest a minimum level of competence.

Obviously a number of changes are necessary to promote the use of changelogs in both the App Manager on the device and the maemo.org website itself, but there should be no question that they are useful and should be made available, I would even go so far as suggesting that applications should not be promoted to extras unless each update is accompanied by a current changelog.

I don't think the additional disk space consumed by changelogs should be an issue - text compresses very well.