I just feel it's worth re-iterating, Chaos doesn't operate on a Faustian-Bargain level. It's not about them offering you stuff, it's about you acting/thinking/etc in such a way as brings their attention to you/makes you compatable and then they simply...give you presents. At least, as I understand it.

There are times when whispery chaos voices have actively offered stuff or talked people into doing things, but that's more about getting people who aren't already acting compatably, as it were, to do so.

Also, I have no idea how the Tau thing works.