This is not my trick dear, It has some other thing to do and in that trick I will not buy the product for some one but he/she will buy himself.
Those aren't tricks either, and in neither of my cases do you have to buy it.
If a person sees if there is a downsell, they can buy at a discounted rate, often as much as 80% off.
Moreover, if anyone signs up for a Clickbank affiliate account, they can get 50-75% back in affiliate commissions by buying through their own link.
If someone combines the two in the combinations mentioned above, they'd be paying as little as 5-10%. Obviously, someone could only offer a 20% discount with the downsells, but with an affiliate commission of 75%, they would still end up only paying 20% after getting their affiliate commission back. Even if there is NO downsell, and the commission is only 50%, that means that a $50 would cost someone only $25 after affiliate commissions. That's better than the 10-20% discount of $45 or $40 out of $50.
They're not really tricks. Just doing due diligence.
Just buy and ask refund is also a method
If you actually view this as a legitimate method, you're a failure as a marketer.