Before the May ban-wave, people were under the impression that hacking was pretty much undetectable since no one got banned before, with the exception of GM item spawning or blatant public hacking. Now, the most discreet hackers somehow got banned, and even those who hacked only on alts have had their mains banned.
It's understandable why people are scared to hack now. You could get an account to level 70 in a few days, but that's no guarantee it won't get banned just as fast.