The A/B testing math for low numbers and low conversion rates is not attractive. You can work the numbers out, but my guesstimate at dinner is that if you get one interview per twenty and mail 100 per week, you'd need almost a year to get confidence on a 6th interview per week. I would A/B test your marketing site as a dev purely to communicate that that is how you think, but it would not provide value to the average unemployed person. (All devs with any desire to ever get a job should have a web prescence, by the way.)
The scenario is more interesting if you rep a lot of candidates. A LinkedIn oe what have you could test resummes or equivalent web views very efficiently indeed.
The scenario is more interesting if you rep a lot of candidates. A LinkedIn oe what have you could test resummes or equivalent web views very efficiently indeed.