2) The map stamp hat is kinda meh; the effect is hard to see and it's only the one hat. Perhaps instead there should be a series of Unusualifiers, which can be applied to any hat, with new map themed Unusual effects -- but they are only visible on that particular map. For example, "Coldfront Snowflakes Unusualifier," or "Mann Manor Tiny Spooks Unusualifier."
They also made an effect when you taunt which is better visible (but obviously during normal play never visible).
To make it even more visible. I think its best to show it on the scoreboard like the killstreak counter. A visible ticket even if it is the same for 1 or 100 stamps still make a player visible for supporting the map. It doesnt even have to be a foreground thingy.
Or as alternative: show it on the screen when you inspect him, or he killed you, or maybe even when he is just healing you/you are aiming at him. Or as MVP. Just have the ticket visible next to his name.
And a side feature that i think would also be more rewarding to medal winners and map supporters: allow a player to select a featured item from the loadout. This can be a strange weapon with such counter, but also a mappers medalion (since its barely visible on the chest), or an unusual. It might be minimal to support mappers but all bits help. This one could show on the deathscreen or be the first item to see when inspecting (or have 2 items inspected at once).
And last: instead of only showing the top X from the duels, show the top X donators from the server you are in with that (alternatively the same for duels). Rather than having to rely on a large friends list this has an instant effect even if you are a new player.
Showing off that you are a good donator to friends just wont do it. many dont have such large list.
I also hope that Valve doesn't discriminate against maps that aren't comp-friendly, as they seem to have done in the past. Some maps are designed specifically for pubs, and that's totally fine.
MvM being a primary example of being a non comp gamemode. But yes... i do heavily agree that pub should be more important than comp. Comp games have rules and those can simply be that certain maps are excluded. They do the same with weapons already.
Perhaps a good idea is to... seperate some maps from being included in the game by default(such as VSH, trade, etc) but still let them have proceeds available, whether that's via the crate method or some other way. That would stop the vanilla game from being flooded with trade/vsh/orange maps, while still letting the creators of those earn money from their hard work.
That just wont be a good idea. What you could call a bad map an other player could call excelent. Some simply judge diffirent. Not to mention opening the door for plagiarism
See cp_orange, a map i never would want to play on. Some will call it excelent, and if they want to donate to that author allow them. The problem though would be variations on that map. They would have to refer to the original which in that case they cant. For that reason i would call a whilelist of maps a safer choise.
However with the workshop you could set a reference to a source as map. So cp_orange_xyz_pyropete also gives donations to cp_orange. Before even accepting a donation people then still would have to rate the map, this would prevent spam of such maps since those would get downrated fast. And plagiarism can be prevented better since less maps will get through that check in the first place.
Allowing all maps is a bad idea as it means people just will spam as much as possible to be lucky. And plagiarism can get out of control that way.