Is it Worth it to Upgrade the Clan Castle

I was wondering if the clan castle building is worth the resources to upgrade it. I rarely attack getting all my resources from farming and use all them for upgrading defenses.
I'm questioning the clan castle and it's ability to be used as defense. The troops that leave the castle during an attack seem really weak and feel wasted. But I also keep requesting troops from my clan mates because I don't know if it would help defend my base.
Best Answer
Its worth upgrading Clan Castle, when u reach new Town Hall level one of first things to do is upgrade clan castle because it helps in offence as well as defense for example: level 3 clan castle can hold powerful dragon. which u can use while attacking or it will defend your village when somebody attacks
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What is the point of upgrading clan castle?
Upgrading the Clan Castle increases its housing spaces, adding 5 units on each new level. Starting on level 4 you can request spells on level 6 you can request Siege Machines. During the upgrade you can use the Clan Castle without any issues.How important is the clan castle?
The Clan Castle troops are very important in higher Leagues. This is because they can distract and possibly kill attacking troops, reducing the attacking army size and wasting precious seconds.Can you use clan castle while its upgrading?
Unlike the Barracks, the Clan Castle remains fully functional even during upgrade. Same with Clan Castle, the Army Camp stays fully functional even during upgrade.When should I rebuild my clan castle?
Before you can partake in any Clan action, you must rebuild the Clan Castle! In your village you'll find an old, abandoned Clan Castle. Tap on it and select "Rebuild." It will cost you 10,000 in Gold. To be able to hold this much Gold, you must be Town Hall level 3 and have your storages updated.Clash of clans clan castle level 1 to 9 max upgrade cost and time
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Answer 2
Only if you are regularly participating in Clan Wars. If not, it's not a big deal. A few extra archers from your clan mates in an attack, meh.
Of course if you are doing wars, then it should probably be upgraded before any defensive structures as this raises your offensive capabilities a lot! You can get donated a Dragon (20 spaces), Pekka (25), or Golem/LavaHound(30) from higher level players to totally destroy bases you're up against.
Answer 3
If higher level members of your clan are willingly donating, it will be very valuable for defence. Even archers are very good defence if they are high level compared to your own (and usuallly then also your attackers). The higher level your clan castle is, the more troops you can hold. Specially an upgrade to level 3 castle is a boost, since it then can hold dragon.
Another thing is if you participate in clan wars, the clan castle is holding all your resource loot you get in the clan wars. If you loot more in the clan war than the clan castle can hold, you will not get everything you earned in the war. Each upgrade will increase the amount of resources you can collect in the clan war.
Edit
After recent game update you also have the star bonus that is stored in the castle storage.
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Images: Tomáš Malík, Tomáš Malík, Tayssir Kadamany, Tayssir Kadamany