Clean Slate Glitch?

Abusing a glitch is against the Terms Of Service. That's why they banned all the BigFoot glitchers.

That's a misleading statement. They didn't ban ALL the bigfoot glitchers, 1/3rd of the people they banned didn't even get to see a bigfoot.

Also, in that case, they did in fact announce that bigfoot is a glitch and there was a huge rolling message saying that all bigfoot abusers would be banned.

When they set up the banning system to catch the people who past an x amount of exp ratio, they started it from the day after the rolling message came up, so if people were "abusing" it before they announced it, they would not get banned unless they continued doing so.

Abusing a glitch =/= Hacking

But it still results in the same effect if you are caught doing it, which would be a suspension/ban.

This I agree with.

I still fail to see why this is a glitch though.

Because:
a) Clean slates are supposed to give you slots when they work, not when they fail.
b) White scrolls are supposed to protect slots, not give you slots.

Two reasons are enough in my opinion.