I noticed that in the StackOverflow data dump many profiles miss the ProfileImageUrl column.
What is the reason for this, because I could still get this data by scraping all profiles that I am interested in, but I guess that is not something StackExchange would want me to do (and it also takes a lot of time, which the data dump could have reduced drastically...)?
EDIT: See this query of my profile on StackOverflow: http://data.stackexchange.com/stackoverflow/query/264578
EDIT2: In case some troll edits that query:
SELECT ProfileImageUrl FROM Users WHERE DisplayName = 'jabbink'