Here is the problem. Why is there even a need for shared storage anyways? With WOW, I could easily mail a horde of items between characters. Also, my bank alt could create a guild and have a ton of storage, seriously. Now, Turbine could fix the mail system and kinships in LOTRO to make this just as easy. They could have easily made it so that VIP could quickly attach 12 stacks of items to a single mail for example, or not require kinships having so many members.
However, Turbine's response is to make something that costs extra.
This is the prime difference in business models with "free(lol)-to-play". There is little incentive to fix annoyances. The incentive is to dip into your wallet. Even if you are VIP, they will try and get as much of your TP spent as possible to get back into your wallet. After all, suckers are actually making excuses for them.