Lets say a user (group) is interested in rumors/forecasts of a specific topic. The idea is now that similar to start a new blog on it with wordpress a user can start a new prediction market (skin) on it with Gnosis. Despite some customization of the appearance everything else will come ready to use by Gnosis software.
There are only 3 exceptions that needs to be taken care of:
1) Event descriptions
3) market makers
1) should be done by the user. They care about the topic, they know what is interesting. 2) Oracles can also be done by the user or they will even be self resolving. Both methods are a little bit unsecure but totally fine if you have a backup mechanism in the case of a conflict like the ultimate oracle.
The tricky part is 3). In principal this is how money can be made because if you can calculate decent odds and offer them as a market maker you can make a lot of money. However - to get a topic/skin started another mechanism needs to be found. In general automated market makers are a solution to this problem - however, they will only in rear cases fund them selfs. So a possibility is to create new tokens and fund the market makers with those new tokens. Lets say you want to do a skin on tv shows (Will Frank and Clair get divorced in the next season of House of Cards) - you could create 50 events with this newly issued coins. To trade on this events people had to buy those coins - basically they can exchange them for Ether. 1 Ether = 1 TV-Show token. If they buy the tokens they create new one and the 1ETH is stored in a contract. Now people can trade on the markets and win more TV-Show tokens. In the end they can exchange their TV-show tokens back to ether but they get only the fraction of Ether they hold back.
An example: One market funded will 100 Tokens. One trader buys 300 tokens. A the beginning of the trading there are 400 tokens in total and 300 Ether that will back this 400 tokens. Since the trader is the only one he will get all 100 tokens from the market maker. In the end he had 400 tokens (all) and with those he can request all 300 Ether. With 200 tokens he could request 150ETH. Its gets interesting if another user also buys 300 Tokens. Now in the end there will be 700 tokens that are covered by 600 Ether. If they are both do equally well trading against the market maker they will both end up with 350 tokens they can both exchange against the 300Ether they spend. If one of the both does better than the other he will as an result get in the end some of the 300 Ether of the other trader.
So the general idea is: you can buy into the game, play it like all others and if you do better than the average user you will end up earning money, otherwise you lose. Although this is true for every interaction on a prediction market the token method is very appealing to collectively fund the market makers by all participants and they don't have to know or understand that they are funding the market maker.