This is so deliberately obtuse it's basically trolling.
Here, I'll bite:
- More players get to play more matches against ever-better opposition. Your squad gets important European experience.
- In getting to the final, you've clearly beaten a number of good teams, perhaps one or two of the best teams. This suggests that you are much better than going out to the likes of CSKA in the group stage does. You almost certainly have a better chance of winning the thing than a team who went out in the group stage.
- Money. You get a fecktonne more getting to the final than you do going out in the group stage. Matchday takings, broadcast fees, commercial desirability.
- Fans get to watch a string of top matches. Many would argue that these days the big CL ties are as good as football gets.
- A club that reaches a CL final will be more attractive to the top players, managers and other staff.