Just my $0.02
Should we even bother with trying to get the cheapest clicks?
The way I see it, this advises sending ads to a broad audience. This means getting our ad in front of the wrong people most of the time. Why not get super specific with your audience instead, and have most of your impressions go to a more relevant audience?
Though the clicks might be cheap, what's the quality like? How many of these one-cent clicks will it take to actually convert into a sale, versus a click that you paid $1 or $2 for?
That said, I feel like it's a bad sign for your margins if we're breaking bank on $1 clicks. (I'm also an inexperienced little newbie, so this could be totally off base.) But I feel like if you bring a $1 click to your website, and it leads to a >$1 earnings, then that's positive EV.
I strongly disagree with this.
I have spent at least $150k on FB ads, and while that may be some, it sure is not that much compared to a lot of people here. But it means I have purchased enough advertisement space for myself to see some patterns in the Facebook algorithm.
Allow me to elaborate.
Your theory would hold true, if the Facebook algorithm would just deliver the same amount of impressions spread evenly over all age groups and gendertype, but it simply does not.
You will notice after spending maybe $200-300+ (or even less in some cases) on a very broad FB ad, that when you breakdown e.g. 'Age', some specific age groups will receive way more impressions than others, and that age group typically also has the cheapest clicks.
After delivering a certain amount of impressions, the algorithm will begin seeing specific patterns in CTR from specific age groups or a specific gender and thus optimize from there. So the more you spend, the less impressions will be delivered to the age groups/genders and other people who do not engage with your ad.
Since I don't work for Facebook, I cannot gurantee this of course, but this is my experience and it always works exactly like that for me. So remember that your first couple of $100 (or less) on your ad is purchase of data to feed the algorithm, so that your ad will perform the best onwards.
Don't be afraid to target broad!