Then, send promotional emails through Auto Responder to your list. Your subscribers will click just 1 same link (main rotator URL), and the rotator will display all the different links to different visitors. Then you can monitor how many links being delivered inside the rotator and stop it when done (You can set it to stop automatically when clicks delivered).
That isn’t to say that sales-y promotions couldn’t ever create results—as marketing “gurus” have proved. The results just aren’t as good as they could be. Take the biggest gurus’ results—the ones they boast about—and calculate their conversion rates. Often their marketing is comparatively ineffective. They just have massive volume, so the sales numbers are impressive.