Why you don't buy in premium
Order Blocks & Premium/Discount
A wide, expensive stop
Buying deep in premium means your stop-loss has to travel through the entire remaining discount zone before it's proven wrong, a wide, expensive risk for a shallow reward if it works.
You're trading against natural sellers
Sellers, meanwhile, are naturally more interested in premium prices, they're getting a better rate to sell at. That's exactly the crowd a late buyer in premium is trading against.
The same logic flips for shorts
The same logic flips for shorts: selling deep in discount means fighting the buyers who see that cheap price as attractive, with a stop that has to survive the whole premium zone above.