Front page streams dont get preroll ads.
If I see a stream on the front page, and whatever is going on on that stream has hooked my attention, that attention is immediately destroyed upon clicking on the stream and an ad plays. Whatever topic is passed, whatever song they may be playing is missed, whatever fight they may be in is over. This then makes me want to simply not watch the stream, and remain on front page, lest I miss out on what is SUPPOSED to get me clicking on the stream. And then instead of joining that stream after I watched the hook that was supposed to get me into the stream but didnt because I want to watch the stream and not watch twitch make money on other peoples work, I then click on one of the streams I follow or sub.

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Mysidia commented
Ads turn away viewers which is highly detrimental and does not seem to be worth it or have any benefits for new and small channels that are not yet compelling enough to keep people watching through ads,
Such channels are more in need of optimal discovery to make growth in viewers from content, first and foremost before they can create a compelling enough chat to later encourage new viewers who click the link to stay on Twitch, keep watching, and paying attention, even through the ads.
The suggestion, therefore, is to temporarily disable ads for any small channels for a given period of time per stream (while they are less than 10 viewers), And create a provision for smaller channels where it is offered to either disable Pre-Rolls - "At Cost", where lost Ad Revenue will be deducted from that month's proceeds of the streamer's subscriptions and bits,
Or allow to disable Pre-roll Ads automatically while the number of current subscribers is high as a percentage compared to either present concurrent views or total views for that day -- and allow this as a community incentive So streamers would be encouraged to sell more subscriptions, and those who sell enough subscriptions (For example: 50% as many subs as views so far that day), or have been "Boosted" Receive a balance of Ad-Free views for non-subs until that number of views is used up.
The display of ads then becomes tied to channels who have a more established audience with a smaller percentage of subscribers watching who will more likely Subscribe or keep watching Twitch through the ads.