Reels can be cheaper new in Japan than in the US to start off with, but it could also be an older model. While not on ebay, I got a used reel off a Japanese website and it's fine. They usually don't try to hide any cosmetic wear from the customer in my browsing, if anything, they point it out. The biggest catch is maybe the reel isn't smooth, but you can generally get a feel from cosmetics(not saying a pretty outside doesn't mean trashed internals or vice versa) or they have a sentence mentioning it. If you can still acquire parts for the reel(check plat.co.jp if it's a jdm reel) it's not much of a gamble.
One thing to keep in mind is having extra to pay import fees, while the chance is low, don't expect to not have to pay them. I think it should be under $50 for a reel.