By the time a game hits a bundle the impact on the developer's bottom line is almost negligible. If you want to support developers, buy their games when they come out. Doing otherwise is "nice," but ineffective.
http://hitboxteam.com/content/articles/dustforce-sales-figur...
http://hitboxteam.com/dustforce-sales-figures
This isn't an exception, either. This is the norm.