Need Help Info On Republic Du Mali Mushroom Stamps 1996

I think the best definition of "wallpaper issues," might be, Issues produced in such quantities as to not be expected to be substantially used by the local/native population in the normal course.

With this definition, would we include the US, Canada, Japan, GB, France, or Germany?

Maybe, but not necessarily. Certainly, countries are happy to memorialize just about anything, and stamps are a revenue source. In 2009, the US printed about 37 billion stamps, but that's only ~100 stamps per person. And with no expiration date and a stable government (so their life expectancy can be measured in decades), that's not an insane number. And, my guess is the majority of those are the flag, a pleasant but entirely utilitarian design with little collecting appeal. In 2002, less than 14b were printed (about 42 per person).
We can compare that to the history of the infamous issues ("dunes") of the Trucial States, which were printed ostensibly for use by a population too poor to buy them and generally illiterate anyway, and with a wink advertised and heavily sold in the West as the main source of income for several of these nations.

It is safe to say that it wasn't even ostensibly printed for use by the population. Some of the topics, like nudity, would not have passed the religious restrictions in those states.

I think some people already are doing it.

At present, Royal Mail offers a 'Collectors Sheet' with most issues. They already included a souvenir sheet with every issue. The reason they issue either ten stamps or a shorter set with a souvenir sheet is that they lose money on an issue if they cannot sell sets to collectors at a certain minimum price (some time ago this, already, was GBP 5.)

Most issues, still, have conventional gum. The Collectors Sheets are self-adhesive.

Now, here are the Blackadder issues:
Set: 2 x 1st class @ GBP 1.10, 2 x 2nd class @ GBP 0.75, 2 x GBP 2, 2 x GBP 2.20 = GBP 12,10
Souvenir sheet: 2 x 1st class @ GBP 1.10, 2 x GBP 2.20 = GBP 6,60



Collectors Sheet = set + 2 x 1st class @ GBP 1.10, i.e., GBP 14.30 postage.
If you want to have all stamps including the self-adhesive versions of the stamps that are included in the set, you need this sheet. It is sold at GBP 15.40, so you pay the equivalent of a first-class stamp over the value for postage.



They do not even hide they are not meant to prepay carriage of mail by calling them Collectors Sheet.

Edit:
I am among those people who do know how to affix a stamp to an envelope and put it in the mail - read some people complaining students are incapable of doing this -. There are several women I sent a card for their birthdays. There, also, are two I write long letters.

When I see posts about modern Dutch stamps or catalogue listings, I just do not recognise the stamps. Over ninety percent of the issues of the last twenty years, I have never seen other than online.
We do not have post offices and, consequently, they cannot stock them. Retailers that run post office counters do not order many different stamps. My local supermarket has been giving me the same card of five stamps for years.

I think that I'm a sucker for wallpaper stamps! :)

@NSK- those British stamps definitely straddle the line. The singles are definitives though perhaps produced to be more of interest to folks interested in the subject matter, but the sheets seem like wallpaper, especially at 15+ quid. I can see these being frequently sold to non- or casual collectors.