With unsalted passwords you can run through the wordlist once, and get all matching passwords with a single MD5 run for each word in your wordlist. It doesn't matter for one single password, but for 60000 salting means 60000 times more work.
Since it is extremely unlikely that all 60000 passwords were the same, you still have to brute force the rest.
If you assume a more reasonable 3000 passwords that are either identical or the same as the mail address for example, the difference between everything salted or not is only 60/57=5% more work.
Salting only (significantly) helps against rainbow tables.