As someone with some direct experience with kickstarted board games, a few are smashing successes and quite a lot are, in terms of play, nothing special. I personally wouldn't want to back a campaign, because the odds are overwhelming that the final product wouldn't be something I'd really want to own.
There are enthusiasts who take the opposite approach -- they back everything because sometimes you get a real gem.
But when software delivers a piece of crap, you end up with much less. Some of the successful iOS games I've backed from small devs don't even work anymore because they eventually stop keeping up with changes to iOS.
All that was needed was the manufacturing, and the costs for about 98% of what goes into a board game are fairly well established.
I've never backed a KS board game, but as an outsider/layperson, that category sounds like an unmitigated runaway success with huge-money-campaigns [0] like Kingdom Death ($12M) and Exploding Kittens ($8.7M), and then humble projects that later became huge, such as Cards Against Humanity ($15K) [1].
But I have backed video games and pay more attention to that category in general. So while I'm aware of great successes like FTL, Undertale, Shovel Knight, and Pillars of Eternity, the category of video game projects seems seems to be much more infused with skepticism and even hostility because of high profile failures like Mighty No. 9 and Clang [2]. Hell, one of the earliest high profile KS failure that I remember hearing about was Code Hero back in 2011 [3]
Obviously, selection/survivor bias is in play here. I read tech blogs so I'll hear more about video game controversies than those of board games. But I feel -- as is the case for software development in general -- there are inherent challenges to video game development that make it seem more risky. Yes, board games have to deal with hardware-manufacturing issues, but it's hard to imagine anything like Star Citizen's creep scope happening to a board game campaign (not that SC is a failure, but its development has definitely evoked feelings of cynicism).
[0] https://www.kickstarter.com/discover/advanced?category_id=12...
[1] https://www.kickstarter.com/projects/maxtemkin/cards-against...
[2] https://www.kickstarter.com/projects/260688528/clang
[3] https://www.kickstarter.com/projects/primerist/code-hero-a-g...