Milesource has gone a long time without a mention in SPAM, so if you infer that its not a favored flyertalk program, I would assert that you are correct.
I had clicked my way to 5000 points, and noticed a ten dollar bill listed on the "5000 point milsource award redemption certificate". So I sent in for the certificate, and was told I would get it in 4 months. When I got it, I was surprised to see that the ten dollars was still there. So I ordered it. I was told that it would be shipped in another 3 months. After about that time, I got an email order confirmation:
"We are happy to inform you that your order from
www.MileSource.com has been shipped.
Please allow 2-4 weeks for your order to be delivered."
A couple of weeks later, I got a small box with a $10 Target gift card, and a note saying, "We're sorry, but your order was temporarily out of stock" and they enclosed the gift card. Temporarily out of stock????

After several more months, I finally used it.
At the milesource certificate site:
http://redeem.milesource.net/cgi-bin...96&id=001-8944
they still have the ten dollar bill, though it is covered with a Walmart logo.
It is described as " Cash or check - - $10.00 in legal tender."
A bit misleading, IMO.