There is still a lot for you to buy in V4 products here. You'll just have to go further in the list to get them, but they are here. Also take a look at the project E figure that was released at CGbytes and should be here some time soon. Also I've been using DS for a long time, what exactly stopped working? Only thing would probably be plugs in the change between DS version 3.0 and 4.0 but then there's been plugins that were broken in the python upgrade in Poser 8 as well, so there is that. Put I'm still able to use some D3 items in the latest version of DS, so what is it that isn't working?

However, if you're asking the vendors to shift back to poser when the sales are no longer there, there's been many threads on this subject.. bottom line is each software comes with its choices. Use what you want, but don't expect vendors to lose money over your choice.