It's already in its 3rd series It's extremely difficult to complete a whole set from circulation as mintage is absurdly low. Can't remember the mintage number - got an impression that it's less than a million each
No idea of how many series there would be. As long as the mint can continue to milk the public interest would most likely be the response. Color $2 coins first started the craze and it hasn't died down yet, making this hobby expensive quickly.
Yes and no. Australia Post exclusively distributes these dollar coins but ultimately its the Royal Australian Mint that strikes them. The same applies to some colored coins that were exclusively distributed by Woolworth.
Does the annual report say who actually pays for these coins? Surely it's Australia Post that pays (at least the bulk of the cost). Looks like the 2021 mintages are down 14% from the 2019 - not a big dip but it will be interesting to see what the 2022 mintages are.