My thought on that is Sylvan offers players the opportunity to have up to five houses for each player. If you decide you need to store more stuff in in a vendor then you really need to get rid of some stuff. I know that in my attached houses I'm no where near my item limit for lockdown or secure items. I don't think that having a cheap/free vendor system will result in players abusing the system for storage, atleast I would hope not hehe