HYPOTHETICAL trade just to show a point
In the following trade of B 46k and sell 4x 48k at market prices
1 lot set margin = 1.2L - flat line profit = 126 rs (0.1%), with max potential profit = 27.1k (15%)
And loss possibility needs like a scenario where index jumps 5% in a few seconds, for most practical purposes not possible
Seems crap roi for 1 lot since higher than flat line profit seems very improbable (and it is)
But imagine on margin of 1cr, 10cr, 100cr 😃

Ps - this is an example, and cannot be the only thing one does, just showing an example of what is possible in certain scenarios, and prices will not always be like this, but one can check the prices here vs the timestamp where I took the screenshots 😃

PS - margin calculation was off in first case so roi on flat like would be even lower than 0.1%, but concept remains the same, and credit can be adjusted by changing ratio to 1:5/6