French Banknote type collecting

When I was in Paris about a year ago, I came across a small shop specialising in banknotes in a covered arcade near Rue Vivienne, where most of the coin dealers in Paris are; I think the shop was called Comptoir des Monnaies/Billets. Anyway I spent my money on a 300 francs (Ceres) from 1938; and that was how my journey to assemble a type set of French Banknotes up until the Euro's inception.

A year later, I've easily gotten all the cheaper, lower denominations, and quite a few of the high denominations, with some of my favourites being;

1902 100 Francs Bleu et Rose
1919 1000 Francs Bleu et Rose
1938 300 Francs Ceres
1938 500 Francs Bleu et Rose
1938 1000 Francs Ceres et Mercure
1942 500 Francs La Paix
1942 100 Francs Descartes
1943 5000 Francs Victoire
1943 1000 Francs Demeter
1944 1000 Francs Commerce et Industrie
1945 5000 Francs Union Française
1946 1000 Francs Minerve et Hercule
1952 10000 Francs Génie
1956 10000 Francs Bonaparte
1957 5000 Francs Terre et Mer

I've noticed the older banknotes before 1900 or even 1920 tend to ramp up massively in value; the 'Bleu' banknotes from 1863, and the 'Noir' ones from 1802-1852 carry massive four-digit premiums; so now I'm moving on to French colonial banknotes.

Just wanted to see how many people collect the high value French banknotes outside France? I'm assuming most people will only have the low denominations they got in lots, but if I'm wrong....

Not to hijack the thread, but is banknote collecting generally significantly more expensive than coin collecting? I have no experience with banknotes other than the few I've collected from circulation when traveling.

I think it is generally much cheaper. But in all honesty, it depends on what it is you want to collect. Their are literally hundreds or thousands of notes that are available for less than a dollar, and in crisp unc condition.

I have several of the higher denominations. I have most of the lower ones also. I am amazed at what is available here in Oklahoma.