for me this nexus stopped existing a long time ago.
Indeed, it's a great service, but the business model makes it so that they discourage you from using the service. As opposed to EF and KVS that have unlimited plans that encourage you to use their service.
It definitely saved me a lot of time in building and improving my RTW itinerary, but back then it was free.
Even if Award Nexus would have limits on the numbers of searches within a given period of time (like they started doing when it was free), but had an unlimited option they would be selling many more memberships.