I personally wouldn't invest to much since it doesn't help pvp
There is a obvious problem though. It makes it much more easy for a chakra powerhouse to blaze through the levels. Like if you have 50 points of chakra, and you have med ninjutsu.
You use Dokugiri and instant 7 levels, then when it gets harder for things like that you still have the stronger attacks with other jutsus.
If that doesn't make sense it's because I was looking at the tv the whole time, I still think it's a bad idea.