>The question is, was he made aware, that his previous agreement will be changed when he was giving some more money?
Any new pledge could easily have a little tickbox "I've read and understood the terms & conditions", I'm not sure if Kickstarter has one but I've seen such boxes pop up everywhere.
2.Change price.
3.Sell some more products.
4.Send lawyers to collect diff on product sold in [1].
The question is, was he made aware, that his previous agreement will be changed when he was giving some more money?