I have a page set up to promote a trial/rebill offer (just pay for shipping) in the beauty niche. My display ad gets about 0.1% CTR, 10% CTR from landing to offer, and 20% conversion on offer. So that is 2% conversion rate, or ~$70 per 100 clicks. And I end up paying about $55 for 100 clicks (CPM).
Obviously that's not a big ROI, but is it the norm for people who still run these beauty rebills via display? The above is after quite a few tests (~20,000 clicks), and I wonder if it's even worth trying to optimize further or just scale up as it is. Of course, scaling up feels risky when I'm running on such a low margin, and every time I improve banner CTR the conversion rate drops - keeping my profit at the same level.
What are your thoughts?