If the cost of digitzing tapes is the issue(not saying it isn't true mind you), then for some shows what is preventing new episodes? Card Sharks & Match Game are currently airing on GSN and Sale was just taken off last year. Those shows should already be digitized ready for Buzzr to air them, if possible.
My thinking here is one of two things (or both I suppose):
1. GSN owns the tapes. Yes, it is not their content, but since they/Sony most likely paid for the cost of transferring the originals to Digibeta, or whatever the current format is, the copies belong to them. The copies just don't go into a public "if you want them, you can use them" area. They hold on to them and when they want to air them, they must pay Fremantle to do so.
2. GSN uses a different format than Fremantle. Meaning that Fremantle would perhaps have to start conversion almost practically from scratch. That takes time and money that clearly Fremantle isn't willing to invest in this upstart.
I think this is a case of people being spoiled. Compared to Buzzr, Decades has had quite the contrasting startup. I don't know what kind of ad revenue they're pulling in, but CBS did a pretty good job of recruiting (I'm not sure how many more O&Os CBS has compared to FOX), and having content ready to go. It's quite the undertaking to produce a new program looking back on history for five days every week with presumably no breaks at all. And they still have more episodes to produce after their first year, since they don't do weekends. They had a pretty good start and continue to do so.
I know there are probably a few differing logistics between the start up of Buzzr and the startup of Decades, but if one giant television conglomerate can get a somewhat niche subchannel up and running, why can't another?