People often prefer to trade options spreads rather than buying options, since those reduce your cost and have a defined profit and loss but what is the probability of success of a spread? For example if I buy a Call with 0.5 delta and sell a strike further with delta of 0.25, doesn't that make net delta for the position 0.25(+0.5-0.25), If so that would mean this spread would move slower than a long option. What that means is that if the underlying had moved 100 delta I would have made 50 delta on long option but only 25 delta on the spread.
I understand that there is lower capital requirement and defined risk/reward but is it correct understanding that it will also reduce delta of position and hence reducing the probability of success?
Edit: Updated(wording changed from point to delta) as suggested in answers below.
Thanks in Advance.