Many good points expressed by several posts here. I especially appreciate the younger collectors chipping in.
And for the record: I was not trying to be negative re: my observations on Admin. Thanks for your response & I want to express gratitude that you're trying to keep the site relevant!
IMHO any collecting of serious nature that requires large sums to be plunked down will only attract limited number of people. It is a niche.
Unlike coins there is very little to have people excited about bank notes. With coins there are new ones every year, it costs "pocket change" to hold on to, and there are many special kinds that are minted every year to keep the interest going for general public.
And I think if the serial numbers were removed from the bank notes then the interest will go down even further.
A) Large sums of money (like an investment) definitely could act as a deterrent for coin collectors to enter this hobby (& I believe a majority of banknote collectors often started as coin collectors)
B) I feel the opposite- that there is a lot more to get excited about a bank note rather than a coin (e.g.: its creation, design, security, numbering, etc) however I know many people still hold the notion that a coin is intrinsically more valuable due to its metal content. But your point about "pocket change" and accessibility into the hobby is a very valid one, and I'm sure a very cogent reason why many shy away from notes.
C) I agree that if the serial numbering process were removed (which makes each note unique) would definitely have a negative impact. Many have noted the loss of inserts as a negative blow. I also feel that many of the older generation collectors have turned their backs on the polymer (yet, ironically, its attracted new blood).