I'm hoarding profile data diffs from a well known social network. Been crawling every single user for the past 2 years and saving the changes. Had to stop doing it last month, after storage costs became too much.
Interesting to hear that storage was too expensive. I'm sure you could find personal sponsors here who would help with funding in exchange for access to the data - even with a 'no commercial use' type of restriction!
It will make a great tool for profiling a person, but I'm not sure on how (il)legal it will be.