They can't pre-order if the game is not kickstarted tho' that should be reason enough

Reason enough for existing fans, and people who's interests closely match the project. Is that where the majority of money comes from? No, it is not.
Do people who were a little iffy on a project in the first place care if it doesn't get funded? No, they do not. There are lots of other games, they they probably have a backlog already.


And if they offer early access for $75 or more, there will definitely be people who complain with all justification.

If the game is listed for sale at $75 with alpha access as a pre-order bonus, people would complain. If it is listed at regular price and there is an option added in the Larian Vault to buy into the alpha, what exactly would be the justification that that must be cheaper than during the kickstarter?


Where are the "likely" complainers

The DD/Anthology add-ons were released games that had been on sale before, multiple times, and everyone knew or could easily find out how much they had been on sale for. They were never presented as being exclusive to the kickstarter, and no reasonable person would think they would not go on sale again before D:OS was released.

Alpha/beta access when offered as part of kickstarter tier rewards, are implicitly... kickstarter rewards. There is no guarantee of exclusivity, unless that is stated, but placing one value on something for your biggest fans and early supporters, then selling it cheaper to everyone else is a tad rude.