I've noticed it too--a whole lot of snipin' goin' on. Perhaps you are right--and we DO need to expand our topics. And World Banknotes does seem like a very logical place to start. I used to have a whole pile of World Bank Notes somewhere, and I am sure they'll turn up again.
One set that I do have on hand that I think is neat is a set of Soviet and Russian banknotes. They are dated right around the time of the breakup of the USSR, so it is fascinating to see how they rapidly evolved.
I have a 3-ruble and 5-ruble note, both dated 1991--the last year of the USSR. However, when the nation broke up, the value of the ruble went down so dramatically that suddenly rubles were being printed in denominations of 500, 1000, 5000, and even 10000! My last note is a 1997 10-ruble note, indicating to me a stabilization of the Russian economy.
Living as we do (most of us) in Canada, we are so used to a stable economy, where the value of our currency rarely fluctuates, and certainly not so wildly as did that of Russia. It's neat to see how thing work in other nations.
BTW, each of those notes I have--I got for less than $1, and they are all UNC.