I've been looking at this forum for 15 years now and have seen a steady flow of the more common GW buttons with some finding multiples at one site.
Pre-internet days you might see one in a magazine or hear about it through the community but that doesn't mean they weren't being found in numbers.
There just wasn't the exposure like the internet provides. Sure there's more hunters nowadays which would add to the volume of buttons being found.
As for the banner, many factors come into play with what makes it up there. It's a whole other kettle of fish.
There's more to rarity than meets the eye. I'll use trade tokens as an example. Out here, I know token collector #1 and #2.
Number 1 wrote the book and is the top buyer. Number 2 is a personal friend.
Say number 2 gets an R10 token (only one known according to the book) he now is the only one that knows that the token becomes an R9, so its in his best interest to stay quiet about it.
He then tells me that #1 actually has 4 of the same token but because he wrote the book, lists it as a R10. It's in everyone's interest to keep that token an R10 because it's worth more.
One time I was with my buddy (#2) out in the country and we went into an antique store and saw 40+ of the same bakery token for sale. The token was an R9 in the book and my buddy bought all of them.
Other than the antique dealer, me and my friend, everyone else still thinks that token is an R9 even though #2 just bought over 40 of them!
In case everyone is wondering why I'm blabbering about this, it's simply to show an example about rarity.
More importantly, it's to send a message about keeping things rare.
Take it from a fur trade guy who watched his entire market crash from some donkey in Michigan who flooded e-bay constantly.
Some people don't understand the concept of supply and demand (scarcity) and sell it all in one shot.
Diamonds are by no means rare. Most of them are keep off the market to maintain scarcity and therefore a high value.
So with the GW buttons, WE know how many have been found thanks to forums but does the general public know?

Cheers,
Dave.