It gives the business traveller flexibility on LCCs that one used to have
from a full Y or C ticket. On high frequency routes of course. I knew a guy who did exactly this on squeezy LGW-AMS. He'd book and pay for two or three flights and on the day would take the flight that suited his needs. It was cheaper than a fully flexible ticket on the network airlines. This was before squeezy's flexible prices.
ExXB
Thanks for that explanation, does make sense in those circumstances.