Guild questions.

1. Can you have negative GP? As in -500/20000 total GP.
2. Can your guild delevel?

Just tried. Can't drop below 0 GP.

Haven't tested #2. But if it works, I'd assume you'd lose Guild Skills available at that level. If that's so, then it's easily exploitable by kicking a major contributor after they buys a skill. Then Reinviting after the skill is lost, to have them rebuy it. And repeat it over and over.

Could be costly, (Cheapest would be 1.4mil?) but it'd net you 1K GP each time.