Someone by the name of "acweed7" from coinsandpins.com has dropped by with a helpful piece of info about geo-acheivement coins, which I had previously blogged about.
coinsandpins make the geo-acheivement coins which commemmorate important geocaching milestone finds (100, 250, 500...)
I had raised the issue about why there is no "50 finds" geo-acheivement coin. Seems that coinsandpins.com did a survey of geocachers.
Their survey revealed that 50 finds is not really regarded by geocachers as a "geo-acheivement". Thanks for the info!