Depends on various aspects bro. It's all about luck.
First you have to hope that the seller isn't a ripper. If he is, then he will just take you money and disappear.
If the seller is genuine, then the best option is to get a private account (not cracked). And to make sure to get only 1 month. Because it'll work only for 1 month. If the seller is telling that he will give you 1 Year account at ₹799 or something, then don't believe him. It'll work for 1 Month and then stop. After that even if you try to reach him, he'll just block you.
And then even if you get an account, Netflix has become very aggressive nowadays in banning such accounts. So, there's no guarantee that your account will survive 1 Month. If the seller is good, then he may give you free replacement.