Originally Posted by kane

Asking for a percentage will be hard. Sometimes conversions can go up or down for a few days or weeks for no apparent reason then level back out. The site owner would likely have to monitor things for a while in order to tell exactly how the new text was affecting sales (if at all).

Then it would come down to how much you earned. You would either have to take their word for it or they would have to open their books up to you. I don't see that as happening. You would be stuck taking their word for it which might be fine and it might not be.

In the end you are likely going to be better off offering this at a flat rate. Many sites are now updating their tours on a regular basis and are always changing their text so if you impressed someone it could lead to a long term deal with them.

To me any kind of percentage payout is likely going to be a nightmare. Just my 2 cents.