RSP offering domain name for $ 10

[wsp]

I was just wading though the archieves and visiting some RSP's sites and
noticed one RSP offering domain name for US $ 10 to his resellers. This
intrigues me, I mean there are other expenses other than $ 10, so where is
the catch ? There are many registrars out there offering domain names for
even lesser and with equally good management features.

Ashish