Should i upgrade my seller's account to a store

i've been selling on ebay for over a year using a seller's account , but i'm now considring opening a store. I was wondering wether there are any worthwhile benefits that having a store will provide and how do stores differ from seller's accounts

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do you realize that by adding an underscore_ between each word in your titles you are messing with the ebay search engines, and may potentially be missing a lot of prospective buyers? as most buyers would not be using an _ as one of the keystrokes in their search?