It seems that you may the
only one that thinks it's an even trade, but wait...
You want to dump
your Concert for a Beta, don't you?
So maybe actually
nobody thinks it's a good deal. Maybe you should "sweeten the pot" a little ($$$).
Of course, this is a very low traffic forum, maybe it will just take a little more time. It doesn't sound like an unreasonable deal to me.
Or; why don't you sell your Concert on eBay and then use the proceeds to buy a Beta?