Class gear, raw materials, lowered prices on shards/crystals, all fantastic ideas. I'd also throw in, maybe instead of class gear, a piece that is needed for some of the top craft/gather gear but can only be obtained from the guild. This is more in the interest of crafters/gatherers but they could do it for combat classes too in different ways. Crafting and Gathering classes haven't seen tons of new gear in a long time, especially not R50 gear. This way they could introduce newer gear, keep leves relevant in some manner and give people goals to work towards.