After some more consideration and reading the comments here, I would argue for leaving the current price as it is, 30 USD.
- Is there a need to increase the price besides your promise?
- 30 USD are imho the maximum price for such a game, no matter the game time.
- Are sales still going up? Is there still a big enough market for increasing the price or did most of the people already bought their copy?
- Will customers who already bought their copy care about what others will pay in the future? Personally, I don't.
I would rather argue for some ingame gimmick to all pre-release customers instead of a price increase.
- Is there a need to increase the price besides your promise?
- 30 USD are imho the maximum price for such a game, no matter the game time.
- Are sales still going up? Is there still a big enough market for increasing the price or did most of the people already bought their copy?
- Will customers who already bought their copy care about what others will pay in the future? Personally, I don't.
I would rather argue for some ingame gimmick to all pre-release customers instead of a price increase.