[jahngod]

Graal Classic always had plenty to do.

Nice quests, with nice prizes - even when Terras were introduced, at least there were plenty of quests to do.

There was lots of NPCs you needed to collect, i.e. Zorbi Ring.

The community was cool, which always helps.

And it wasn't all about PKing - that was something people did when they no longer had anything to do.
I used to pride myself in being a Saint.

Someone said earlier: Just put the first Graal Classic back online.
Although this isn't possible due to the NPC Server - I think it would be much better to convert the old world over, rather than trying to 'create' something Classic-ish from scratch.