You don't need an audit trail, you need a Kickstarter that makes sense. If stretch goals are always in equal subsequent increases you know someone has no clue what they are doing. Giving a flat rate increase every tier for different things is a sham. Its never that clean.
A Kickstarter should lay out where every dollar is being spent with for their funded goal. If a 5k project is laying down that division in 500 dollar increments... They're out to get your money and have no clue. Breakdowns need to make sense and you'll never pay the same amount for 10 different elements.
Arbitrary increases that always hit a rather large rounding are red flags. Why does it cost 25k EXACTLY for tier X and 25k for tier Y? Why isn't it 22,250? Or 26,180?
A Kickstarter should never be backed if a first Kickstarter failed and a second one is promising the same thing at a lower price. Something is up. Promising X, Y and Z for 10k then failing and launching a sequel Kickstarter for X, Y and Z for 4k is another red flag. How can the exact same project cost so much less this time around? I want to see a KS with 18,362 as a goal with financials laid out, not 20k flat. Is asking for legit financials too much? Are my expectations too high?
Unless a KS has a brilliant financial plan laid out in its pitch, I won't back it UNLESS I know the person (<3 IndieGAF). You don't need an audit, you need to just read between the lines.
Edit: in addition, I've seen KS blatantly tell you they inflate pricing due to KS and Amazon cuts. You know what? Fuck your shit. That's yours to eat when you ask for coin. As someone who will be making my way to KS soon for a project I'm laying my shit down clean. No "food" costs. Just costs for software and Dev kits. I need to cut my teeth somewhere and I don't expect people to cover every corner of development, that's my burden to fill in the blanks.
Rant end.