Polymer First And Last Issue, Test Notes.

Hi all, I have been collecting first, last and test issue polymer notes and thought the members might find this stuff interesting. The following figures represent a very small random selection of our polymer bank notes I have recently checked along with the notes I collected and chances of picking up in change.
$10, checked 200 notes for AA03 & AA07. A 1 % chance of finding in change.
$20, checked 100 notes for zip. Says it all.
$50, checked 200 notes for AA04 and JC06. A 1% chance in change.
$100, checked 100 notes for 2 X AN96; CF 98; AA96 & AA99. A 5% chance if you ever get $100 notes?
After I had collected the $100 notes dated 1996 I was wondering what the real value of our $100 note is actually worth when inflation is subtracted from the original $100 investment back in 1996. Australian Bureau of Statistics figures show that, from 1997 to 2010 inclusive, inflation was about 37.1 %. Without reducing the principle, this effectively means the note is now worth, at the very most, $62.90. Does it pay to delay collecting in this case even if the $100 note is limited in its circulation in the interim? Or would it be better to invest the money in uncirculated coinage and notes?
I have been told through contacts that sadly all paper notes, the $5 2001 Commemorative note and all 1988 $10 bicentennial notes are removed from circulation at banks. This brought tears to my eyes knowing I have nearly no chance of picking one up in change. Badly worn, holed or torn Australian polymer notes are similarly removed from circulation.
Anyway, something to consider, comments?