I was also wondering about this. The brand is extremely popular in Europe, but is relatively unknown here in the States. There probably aren't that many out there to begin with, which makes it surprising that so many would show up for sale at the same time. On the other hand, like the other post mentioned, product models do seem to show up for sale here in groups. For example, someone will post a Plinius SA-100 or an ARC VT-100, and within a few days you might see three or four other ones pop up.
I bought my ST 13.01 here, and over the next few weeks I saw at least three others come up for sale. The seller of my unit upgraded to a pair of the brand new VAC 30/30 series 5 tube amps which retail for $7000/ea.
What is also surprising, is that at the prices these are going for, they don't get snatched up quicker-but again, the Aloia name isn't that well known. For the money, you would be hard-pressed to find a better deal. The people that are buying the Brystons, McCormacks, ect. for the same money just don't know what they are missing...