It's not a literal translation, but rather a way of saying:
* "You get something out of it."
* "There's a benefit to buying."
* "Buying is worthwhile."
The phrase is often used in a sales context to encourage people to buy something.
For example:
* A salesperson might say "Buy this product, kuch hota hai!" meaning "Buy this product, it will be beneficial for you!"
* A friend might say "Buy that new phone, kuch hota hai!" meaning "You should buy that new phone, it's worth it!"
It's important to note that the phrase is not always a literal guarantee that something good will happen. It's more of a playful way of saying that there's a positive outcome to buying something.