Well, the page you linked to actually "looks better" than a typical page you get on bountysource.com, but even it shows that only handful projects receive good

Well, the page you linked to actually "looks better" than a typical page you get on bountysource.com, but even it shows that only handful projects receive good funding, other mostly "motivational pack", and clicking around, there will be lots of zeros. So, I guess it lies more on well-known and wide-scope projects to promote such services and make them popular, whereas Kickstarter is an already popular platform with active community around. In our case, Kickstarter was just the right choice overall - we're aware that there're well known competitors, and we want to see if there's enough community interest to back development and support for a reasonable time (half-year, better a year). Starting a KS campaign requires a lot of preparation, but I guess it's good again, because it allows to sanity-test earlier exciting ideas, to see if you really can pledge to implement them.