Paying the ransom does not guarantee you will get a decryption key. It also encourages other hackers to target you in the future because they know you meet demands. On the other hand, you could be on the verge of losing a critical file, and paying the ransom may be the only option. If the risk of losing your essential documents outweighs the ransom demanded, then you should pay. Even some reputable organizations pay a lot of money to recover their data.