Well, as your 24 hour window is long gone, you have made your decision...
I would have spent 100 $ as well for 4 legs. Not that you get anything special onboard (as mentioned above), but potentially it gets you 4 lounge accesses (it seems that you don’t have Star Gold) and (if you care) get 3 times or so point earnings.
If your HAJ-CPH-leg is on time and at least one of your flights arrives/departs pier D (remote parking busses dock just in front of the lounge) you will even have time for cup of coffee at the SK lounge in CPH.