Evaluting best ad considering costs?

I work with digital marketing and Im trying to improve my testing my ads more correctly.
By using https://neilpatel.com/ab-testing-calculator/
I can verify that my tests are reaching 95-statistically significant.
But I would also consider the cost per conversion. An example: Ad 1: Clicks 300 conversions: 30 cost 5000 Ad 2: Clicks 200 conversions: 50 cost 50000
By using the tool I linked to I can conclude that Ad2 is the winner. But when looking at the costs the cost per conversion is way more expensive.
Is there any logic way to include costs when I compare ads?