Stu, just a heads up, you don't need to log in EACH toon every other day. you just need to log in at least one toon on that account every other day to keep the items up.
for example, lets say you play an alt, grind out lots of XP going thru some zone and get lucky with your rolls and get lots of stuff to sell. you put those items on the broker to sell. so long as you log in another toon on that same account at least every other day or more frequently, those items will remain listed on the broker.