http://wiki.teamfortress.com/wiki/StampsMap stamps are purchasable items that were added to the Mann Co. Store during the Australian Christmas event with the December 17, 2010 update.
The stamps were created to support map makers. Each stamp corresponds to a particular community-constructed map, and all proceeds from stamp sales go directly to the map creators.
Upon purchase, players receive the World Traveler's Hat which shows a special particle effect when the user is playing on a map linked to the stamp that was bought at the store.
the Map Stamps are only for the 'officially released by Valve' community made maps
This, since Blackmesa is not an official Valve "Community Map", there is no stamp for it.
this should change.
That's your opinion. Either Valve hasn't noticed it or it isn't "outstanding quality" (TF2Wiki) to them.
Blackmesa2 would be a better candidate for official release.
That being said it does sound a little fishy when only maps that are official releases may receive $.
~D

Them using us to help pay their royalties?![]()
what royalties? the maps were submitted for free by the community. If you mean to pay the roaylties they have now decided to give the map makers then mesa too would receive royalties.. king of like a chicken and the egg delima. which came first?
Well, the "official" maps are included with every package of TF2. There's a difference between that and unofficial maps people download elsewhere.