Companies certainly are to blame, but most OSS projects need support and I want to support them, but they make it impossible.

Why do you want to negotiate? Large corps are burocracies. I can only get mine to donate to a registered charity, is your project one? To pay a bill is easier.

There are few people that have authority to negotiate and their time is expensive. If they spend two hours to "negotiate", they are charging a pile of money the company could have paid you instead.