"When does it make sense buying Calls ITM ?
Isn't one then risking more than is necessary?"
I would say the basic answer is it is the closest "synthetic" to just buying the stock. The difference being the option allows you to control 100 shares a lot cheaper than buying 100 shares . Also the cost is determined by how much intrinsic value is in the option so the option buyer sets that cost or risk when choosing the in the money strike price. The on the money options always have the highest premium in the option chain so if one was trying to not have to pay so much premium, they could buy an in the money option (or out of the money,)
The in the money is more risk (more expensive) as one is buying the intrinsic value in the option price, (max loss is price paid for option) but they are paying less premium in the option price compared to the on the money option. So they have lowered premium risk.
It works like this:
375.0 Call
63.00 - 12 intrinsic value - 51.00 premium
380.0 Call 60.00 - 7 intrinsic value - 53.00 premium
385.0 Call 57.50 - 2 intrinsic value - 55.50 premium
stock at 387
390.0 Call 54.50 - 0 intrinsic value - 54.50 premium
395.0 Call 52.00 - 0 intrinsic value - 52.00 premium
400.0 Call 49.50 - 0 intrinsic value - 49.50 premium
Let's say you buy the 390 call for 54.50 . Stock moves to 400.
Prices adjust to intrinsic values and premium values.
375.0 Call 70
.00 - 25 intrinsic value - 45.00 premium
380.0 Call 67.00 - 20 intrinsic value - 47.00 premium
385.0 Call 64
.50 - 15 intrinsic value - 49.50 premium
390.0 Call 61.0
0 - 10 intrinsic value - 51.00 premium
395.0 Call 58.00 - 5 intrinsic value - 53.00 premium
stock at 400
400.0 Call 55
.50 - 0 intrinsic value - 55.50 premium
You call is now worth 61. You paid 54.50 your profit is 6.50
If you bought the in the money call with less premium in it's price:
Bought the 375 call instead of the 390:
It's now worth 70 and you paid 63 your profit is 7.00
So you made .5 more on the same move by buying in the money option. Doesn't seem like a lot but if one was trading 20,000 options it would be an extra $10,000, But then the most you could lose on the 389 call is 54.50. The most you could lose on the 375 call is 63.00 More risk = more reward or more loss.
I would also add people buy the calls in the money for other strategies as well. Like buy the in the money, stock moves up, sell the on the money make it a spread. with fixed profit. Buy less. premium, sell more etc.
Like buy the 380 for 60
Stock moves to 400
Sell the 400 call for 54.50 making it a spread
stock stays above 400 your profit is 14.50 double what you got buying 70 alone. But then spread profit can't go above that. The 70 has unlimited profit. Lot's of options!