Thanks guys! As you've already spotted we're live on Kickstarter(!) at
https://www.kickstarter.com/projects/rocketjumptechnology/king-under-the-mountain?ref=3svtdiPricing is a very dividing issue when it comes to indie games. I've been bitten by Brexit and the falling pound (all the freelanced work is paid in USD or euros) so the backer levels have had a lot of agonising over. It really comes down to if I dropped the lowest backer amount from £17 to £10, I'd need 1.7x the number of backers at that pledge level to get to the same amount, never mind bringing in more funds, so realistically there'd have to be twice as many backers at the lowest pledge level, which will likely make up 80% to 90% of all pledges. So overall the campaign would need around twice as many backers if I'm to drop the cost of the £17 pledge. I agree that dropping the amount will bring in *more* backers, but I don't think it would be enough to have a positive effect, instead the opposite, I think it'd hurt the campaign's chances.
I could very easily be wrong about the success or failure of those figures - I'd love to be able to offer the game at very little if it meant I was still able to produce it. Overall though, I think it's technically a niche genre which attracts a lot of "I really like this kind of game, so I like the look of this game" players, which means fewer backers who are generally happier to pledge a bit more, than a large number of backers who are happy to pledge less. I believe that's why Rimworld is priced as it is currently for sale without seeing any discounts - it's a big success but it's still a relatively niche market, which you tend to see a lot in strategy, grand strategy and 4X titles.
So I hope you can understand the pledge levels are not based out of greed in any form (well, except the top tiers, they're really just there in case a rich philanthropist comes along!), but in trying to maximise the chances of making the Kickstarter a success and being able to develop the game fully.