Still haven't been able to find an answer for this. When setting up an ad, how big should the potential reach be so the campaign can be scalable?
The current campaign I have gives me around 170% ROI on 900,000 Potential Reach, I am not sure if this is scalable.
It really all depends on what you're trying to accomplish
If you are hitting something very niche then 50,000 people might be very beneficial and might have the potential to produce A LOT of sales.
If you are hitting something mass market 50,000 might be nothing and not have much potential at all.
Don't get caught up in the numbers.
This question is too vague. What are you trying to accomplish? If you are trying to sell luxury islands in Maldives, 900,000 potential reach if amazing. If you are trying to push an mass app download at a few cents per download, that's not going to get you very far.