If advertisers see your regional viewers as being of less value due to the nature of the market, then they are of less value.
Its the TV moguls that put a value on the NRL rights & pay big money for Origin - the winner of the rights does a deal with regional operators. The advertising rates in each of the areas covered by the ratings obviously attract different rates for advertisers in individual areas, the stronger the viewing numbers (including those 1m + you describe as not worth anything), the greater the demand by advertisers, the higher the rates charged.
You can be sure the strength of the Origin viewership in NNSW would obviously surpass Perth/WA or Adelaide/SA, and for you to claim 1m viewers is not of value is nonsense:
1M viewers on fte isn't worth anything