Enable bits to be used to purchase subscriptions for channels.

Give discount on channel subscription cost, based on bits purchased or bits in stock.

Would save twitch money on payment/card processing fees per subscription as money already with twitch.

Would encourage more people to sub to channels to get good discount worth the % fees paid to get bits.

Subscribing to XX channels based on % would give cover any % payed to get the bits, this would encourage use of bits, and give discounts to those that supported more channels with subscriptions, and more usage of bits.

Would save money for Twitch, less payment processing fees and save money for the viewer if they subscribe to multi channels, also only pay one local tax per transaction for bits, usually you would have to pay that tax on each subscription if from certain areas.