As qdz has stated, the purchase of long options is non-marginable, comes out of cash. Buying options does not put the clearing firm at risk, since it is paid upfront in cash. No margin is involved. No money is borrowed by the trader from the broker.Quote from Rigel:
The purpose of the rule, is not to protect the trader, it is to protect the clearing firms. It may or may not be the "real" reason for the rule.
"Although the day trader may end the day with no position, the day traderâs clearing firm is at risk during the day if credit is extended. To address this risk, the NASD and NYSE require day traders to demonstrate that they have the ability to meet the initial margin requirements for at least their largest open position during the day."
If they want to say that buying options from a margin account will deduct from the margin value of the account, thus possibly restricting the daytrading of stocks if the margin value falls below $25,000, that would at least make sense. But to subject the cash-purchased options themselves to the three trade restriction is not logical. The brokers are not put at risk by the options trades.
Whereas, increasing the intraday margin to 4:1, which is what they have done, does put the broker at risk, much greater risk than before when it was "only" 2:1.
This is why these rules are illogical. They achieve the opposite of what they claim to be designed to do.


