Its the users that have value,.
On a more sinister note... how much do you think all that ID information for the verified users is worth?
When they locked BTC withdrawals for unverified users, I adamantly refused to verify because I'd rather lose the few BTC I had there than give them the ID info. Went back and forth with support for weeks arguing that it couldn't possibly help prove I owned the account. Suggested that for KYC, it should be sufficient to let me transfer ("gift") my BTC to another (verified) account if they needed to know where the BTC went. Every response boiled down to please verify (i.e. send us a big pile of personal info)
Thats why it is kinda amusing to assume there is not market for mtgox. Plenty of assholes both legal and otherwise would love all that info.