My personal opinion: either RD pays her for all the extra coverage, or it is all part of an arrangement for a reduced rate.
That latter option crossed my mind the very first time I read her mentioning them in print. Think that was back when she only had 8 spots or so. She must have mentioned their name at least 6 times in her blog. Any opportunity for sticking the plug in, she did. It was abnormal, forced.
Of course it could be RD writing them too, ha haa!