Micronation - Petoria revisited

 Rule #8 of Collecting - Found your own country and print your own stamps and currency, or find the smallest country on earth and buy their stamps and currency, or program your own World on the Internet and get everyone to recognize it and then code your own currency, and trade it for currency that's actually worth something.

Personally, I am looking for stamps from the kingdoms of Hutt River Province (a kingdom in Australia), Sealand, Lundy, and Rattlesnake Island on Lake Erie to add to my collection.

Micronations – sometimes also referred to as a cybernations, fantasy countries, model countries, and new country projects – are entities that resemble independent nations or states but which are unrecognized by them, and which for the most part exist only on paper, on the Internet, or in the minds of their creators. Micronations differ from secession and self-determination movements in that they are largely viewed as being eccentric and ephemeral in nature, and are often created and maintained by a single person or family group.

Source: Micronation - Wikipedia, the free encyclopedia

And possibly if Second Life starts issuing postage stamps they may be worth collecting.

One argument that Second Life is no longer a game is that you have news agencies, embassies and department stores like Sears setting up a virtual place inside the virtual world. More discussion of the ban on virtual goods except for those found Second Life can be found on Auctionbytes, Marketing Vox and ITWire. Also at Auctionbytes Ina Steiner speculates about the possibility of a Second Life acquisition by eBay.
If you run a "Second Life" search on eBay you will currently see over 100 items -- most of which are Lindens or Linden Dollars -- the currency traded inside the Second Life virtual world.

Source: http://www.traderstrade.com/

Some Hutt River stamps go for less than $10 on e-Bay, you can get your Rattlesnake Island stamps here.

The summer staff, mostly Eastern European, is around 28, and there are separate dorms for the men and women working there. There is also a year-round caretaker and professional chef. The island's workers are trained to recognize each of the members and their families both by appearance and by the yacht they come in on. Any non-members will immediately be turned away by armed Security guards in one of the island's two boats before the intruders even have time to dock.

In order to join the Island Club, one of the current members must quit, and the potential member must receive recommendations from at least two of the island's current members. The cost to join is estimated to be between $100,000 and $300,000 initially, as well as a monthly maintenance fee.

Rattlesnake Island is the world's most exclusive playground of the wealthy, according to the Discovery Channel.

http://en.wikipedia.org/wiki/Rattlesnake_Island_(Lake_Erie)

For a population of 2 people, they must be pretty important.

The island operates the only USPS-sanctioned local post operating in the United States.