I opened every letter of the alphabet to keep any of them from being grabbed by a squatter (I did this after making a largeish transfer to smooth-e and then having a quick moment of panic when I realized I wasn't sure if I had created it or if I had stopped at smooth-d). The first few were for organizational and trading purposes. Most are totally unused. None of these accounts have anything to do with interest (I earn the same whether it is one account or ten) or powering down or posting.