I was in a shop several years ago, and they asked me "What could we stock that you would buy?". After thinking a bit, "I have everything I need, and will likely only buy unusual items, or upgrades to my tackle from here on. On occasion I will replace a damaged, lost, or used-up item, but you really need to speak with beginners to stock for them."

Actually at this stage I'm tempted to post stuff on E-bay to clear my shelves. I have more toys than a small shop.