"Supply and demand, Professor," Spike stated simply, joining the back of the group. He'd spent a few moments longer to finish up pulling out those fangs and running to put them up on the top desk. "Though you have to wonder why they haven't managed to grow more of them. Surely common sense would tell you that trying to regrow them in a greenhouse is going to fail when they need the decaying debris in a forest to survive. A magical forest at that." Sometimes Spike did wonder where adults got their logic from. Surely the best way would be to recreate their natural environment. Or, just protect them in the short term. Those minty sweets surely couldn't be that desirable, could they? He'd never had one to know.