Could it be one guy with all those hundreds of websites or is it some formula that converts best? I see prices of $97, $67, $27 or some other price ending in a 7. Any good reasons?
I think it makes the price appear cheaper eg. $27 may appear cheaper then $25. I would assume after much testing the 7 converted better.
It is related to marketing psychology. A report cost $5 may look less attractive to one that costs $7
Yes, it is generally agreed that prices ending in 7 convert better. I suspect though that after such a long time of "7s" that might start to change or at least not be as effective as it used to.
The funny thing is I was going to test one of my products with a different ending number - I was going to try 3 or 4 but guess what? In the end I went for 7!