Not likely, considering a Twitch Prime subscription is worth $2.50 to the streamer, so 250 bits would be more likely.

I also have not been able to watch ads for bits since late June/ early July.. I tried contacting support about it, and they basically told me tough bananas because ads for bits is not a guaranteed feature. I am a full time streamer and this is how I support people in my community, I cannot afford to just buy the bits and Twitch is not letting me earn them.