Where have all the domains gone?

[2002mjf]

I was just over at sedo and I noticed that the domain T-E-S-T.com sold for $2115 US and I thought to myself that I should check this out...I did a search for L-L-L-L's and to my suprise, all of the ones I looked for were already reged. This was just a quick search, like 1-1-1-1 and a-a-a-a and b-b-b-b etc. The deeper I dug, the harder it was to find any that were available...What is going on with these domains? I don't really see them anwhere for sale. Are they "the next big thing"?:?: I really want to know this....Thanks, Mark