:imho: .fm is fighting the same problem as many other extensions such as .vg, .vc, etc. they are not valued as desirable, unless you have one of these huge keywords: poker, law, sex, .... (that's aside from the obvious target market of fm radio stations)
I'm sitting on a few LL.vg myself and can't seem to see the light at the end of the tunnel...
At the very best, i'd aim for low $xxx for the rare ones (LL/NN), mid $xxx for decent keywords, mid-high $xxx for the great keywords.
IB