I came here hoping to find some answers to the bots visiting my parcel and I certainly did! I'm sorry that so many of us are experiencing this issue but hopefully the problem(s) are sorted soon.
I've had the issue for the past few weeks and it's annoying. I added a whitelist to the Linden Security System when I set it up (the latest update) and I parcel banned the 10 bots. As mentioned previously (sorry I don't recall the OP), I too noticed that the accounts are between 90-120+ days old and the profiles are empty.
I submitted an AR tonight after reading through this thread. Having a visitor list script made it easy to collect the names.