If Amazon is selling their own stuff for Amazon bucks (and people still want to buy stuff from Amazon so that Amazon bucks have a non-zero market price), there's a minimum finite amount of Amazon bucks that I would gladly accept.

If Amazon bucks weren't very commonly used (think like bitcoin today), I would probably ask for a premium over USD just to make up for the inconvenience of having to exchange them.

If Amazon bucks were more commonly used in daily life than USD, I might even accept a slight discount.

> If you worked for amazon, would you accept amazon bucks as salary?

That's actually an even easier question. Amazon already pays their employees partially in Amazon stock. At a big enough stock offering (and frequent enough vesting), I'd happily accept an all shares compensation.

Now, Amazon bucks would be different from Amazon shares. But the only thing that matters to me when accepting compensation in shares is how easy it is for me to convert the shares (or bucks!) into something I actually want later.