In building some networks myself (the mucho private kind not rentals PLEASE do not PM wanting links on any of them) I have been coming across an unbelievable price hike in domains since the deindexing. Its not a surprise to see good high Pr domains going up since with the deindexing theres a demand but thats NOT what I am referring to. You might think that any price increase does not affect you if you are not building a network but read on on how it does.
Very importantly the prices I am referring to are even those domains that have little or no links showing to them. Thats a problem for you because In other words people are buying up domains that have almost no juice but still show a high PR and the only conclusion I can draw is that they are doing this to be able to SHOW a high PR domain while knowing there is none (theres no other logical reason).
Straight to the point?
If you rent links on a domain like this you will not be getting anything near advertised but they will be getting your money. TO understand realize that Google only updates its public tool once ever few months. If a domain has lost all its links since the last update it will still show a high PR and fool you into thinking that you are getting lots of link juice when basically its all gone (and don't buy the lies being told by some that PR is created by anything else but links). Even though thats the case for the PUBLIC tool bar the algo is constantly updating PR internally at Google and THAT is what Google's ranking depends on. SO some of these sites being bought up are being bought up to give the APPEARANCE of ranking power. Only months from now will the PR tool bar update and clue you in that all the time you were paying you were getting PR1s and PR zeros.
I can think of no other reason but to false impress clients that some of these domains are being bought up. I can't tell who is doing the buying or how many services are doing this but if you do start finding your links showing up again after the service you use regains indexed high Pr domains you might want to check the backlinks of that backlink source. Otherwise you could be paying for air.