Both of what you describe is basically using fake currency to buy fake currency and items. Twitch wouldn’t approve of this
Please refer to the AUP → Twitch.tv - Bits Acceptable Use
Specifically point 17:
Soliciting goods, services or digital content (including displaying certain chat messages, playing a game, being “friends,” or starting a private conversation) in exchange for Bits, or exchanging Bits for goods or services or digital content;
And 18
Soliciting Bits for goods or services or digital content (including displaying certain chat messages, playing a game, being “friends,” or starting a private conversation), or exchanging goods or services or digital content for Bits;
I of course stand to be corrected here, but bits should not be used to purchase things, they are used to tip the broadcaster