Here's the thing, having a shared account is 'against PlaneShift rules' in other words you can do it but don't complain to the GMs and Devs that someone stole all your crap. That's how I interpret most of PlaneShift's rules anyways. Otherwise if I'm wrong then save your trias and buy a gh.
Players pay huge sums of trias for ghs and the reason being is to bring their guild together, so lets face it that guild sharing/storage is just apart of paying for/having a guild house.
Not all guilds have a guild house. So enabling guild storage is really a good idea.
Well, your reason.
it has the same issues of the gh so no it's not a solution. actually it's even worse
So according to Weltall. Hoarding items in storage is just as bad as storing them in a guild house. And therefore guild storage will never be implemented because storage tends to be a players never ending pit of items, I could not even imagine the amount of items hoarded by one guild alone.
The point of guild houses being expensive and hard to come by is because of the same issue, if you just have guild storage it would be like allowing everyone and anyone a guild house. If that made sense.