Don't make elixer only used for level 9 walls!!! here's why
I'm TH8. I am a very active player - I raid a lot.
The problem is I am going to have NOTHING to do with elixer.
There is a bottleneck on what I can spend elixer on - barracks, troops, laboratory and a few one offs here and there.
I already have more elixer than I know what to do with!
I'm going to be sitting on max elixer with nothing to do with it other than wait for someone to raid and take it. And now elixer is going to be easier to get.
This is a horrible, horrible idea.
If you HAVE to do this, then give us a second laboratory. The laboratory was already the bottleneck in advancing and now you made it way worse.