[jjeaff]

Imo, assuming the hackers are acting logically, the payment of the random will be followed up by another request for more money or the sale of said data on the black market.

Since they are anonymous, there is no logical reason to keep their word. It's not like they have a reputation to keep up.

[rrobukef]

It's an asymmetrical game of tit-for-tat. If the hackers don't keep their word often enough the companies won't play the game again. Pay regardless of the hackers keeping their word and you make yourself vulnerable.