Hi Sergein,
These campaigns were randomly picked and we did not to fiddle with the numbers.
In other words, it's real campaigns.
The reason we picked these campaigns is neither that they were good or bad, but just the fact that we had ALL the info (including conversion and payout).
This last information (conversion / payout) we usually don't have.
I've seen on forums people claiming they had a 100%+ CR but we could not decently use this information since we lack the background info.
It also depends on the campaign budget, based on what I've seen (I am not an affiliate myself), it's easier to get a high ROI on a small campaign than on a $xxx,xxx campaign.
You might also have a very high ROI for a few days then if the campaign lasts longer you might see a decrease over time (in which case most of the guys here will advise you to update the LP and banners).
Finally, this data is from our previous version of TJ, where it was harder to split your budget on a high number of spots so click attrition came quicker.
Thanks