First: I have paid my $10, love the game, and support the devs in their mission to make this game the best they can be!
With that said, I think the mentality of why people should pay needs to change.
People, as consumers, are only interested in themselves (for the most part). They only care about the best deals they can get themselves, and how products benefits them personally.
BMW (replace any car company you want) does not tell their clients "buy this car so we can continue to make our cars better". Call of Duty does not tell their players "buy this game to support our development of future games".
Instead they focus on how purchasing their products benefits you personally. BMW says "buy our car and YOU will stand out from the crowd". Call of Duty says "buy our game and YOU can rule the battle field".
Personally, I am all for supporting the devs. However, that does not translate to many people who may never think twice about the devs.
I agree with what topkilla mentioned in an earlier post for payment system. The system would be...
All are one time purchases
L2 - $10
L1 (no ads) - $2.99
L1 (unlimited moves) - $2.99
L1 (player notes) - $2.99
L1 (rated/ranked games) - $2.99
Then you advertise it as...
L2 - YOU save money, and YOU have free reign
L1 (no ads) - YOU don't get annoyed by all those ads
L1 (unlimited moves) - YOU have the freedom to see into the future
L1 (player notes) - YOU can keep track of your enemies
L1 (rated/ranked games) - You can play with the big boys/girls
By breaking up the prices, people may feel more comfortable paying money. By telling people what they will get out of the deal, they may feel like they are getting a deal based on what they want. The devs are being supported by people buying what the people want, rather than paying money to support someone they don't know.
I hope that all makes sense, and apologize for the long explaination. I love this game and I hope to see it continue for a long time!!
