I think the ones they release on their website are frequently requested subjects.
Working with government records, I can say that it is a pain in the ass to go through documents and redact names, addresses, etc. so the cost is probably justifiable.
No doubt it takes time to go through the stuff and it must be a pain in the ass to do. My only complaint would be paying per page and then seeing 90% of it redacted or unreadable. I'd be more then happy to pay them double or more and get the untouched files....but unfortunately that isn't an option they make available.
Another thing i'd love to get is access to the fed mugshots. They must have tons of good pics of the hoodlums that we've never seen.
I'd be more then happy to pay them double or more and get the untouched files....but unfortunately that isn't an option they make available. 
