conversely, if you spent more time and money on the game rather than marketing, that 'small group' of people that follow the game releases would be more dedicated to supporting the product, ergo your need for getting the word out in 'traditional' marketing veins would be decreased. Then, just like you want, people will start telling other people that they should go buy the game because the game maker actually took the effort to make it badass, instead of some lame, reinvention of the wheel with adverts and long load screens and bad AI, not to mention bugs that will never get fixed. Most game companies spend so much on marketing because they've sold their integrity for greed and status quo. Ironically, in this system, they have themselves to blame. They wind up telling the consumer what they want, and then forcing it down their throats, then blaming them for their lack of sales (of the crappy game), crying it's because of piracy or whatever else, EXCEPT improving the game by spending more on development. It's one thing to add devs mid-development ... it's another, completely, to plan for more devs up front, and less marketing.
If you build it, they will come. If you say you built it, and there is just an empty field, you may have gotten your admission ticket, but your return sales are going to suck. The corporate mentality nowadays is that someone else 'copied' your 'great idea' and is giving it away for free. What really happened is that once the people you tried to fool realized it's just an empty field you're charging admission for ... they started going to the public park because you offered nothing substantive for consumption.