I can't speak to the logic as to why they put in a “no bidder” in each instance. There may have been a business reason at the time. But I'd ask why you would continue to send, with regard to this one client, requests to this company that continually provided no bid letters? Why not try to expand the group of those you were sending the RFPs to?
On May 7th, 2007. See this statement in context.