Even more than the ad copy, I often test multiple ad sets only changing the bidding style (CPC, CPM, pay per website click, pay per page like, etc.)
Once you're scraping a highly targeted audience, in theory your CTR should be really high, making CPM give you the lowest cost per conversion.
What has your experience lead to being the best bidding type with this method?
Also, I believe it's not possible to do $1 per day on an ad set if you need to bid around $2.00 per 1k impressions? You'd have to do double ($4.00/day), correct?
Thanks