Can someone explain this to me? I feel like I'm missing something.

Normal Leves for my miner at 56 give:

168,399 exp (assuming I get the bonuses) x1 allowance

Large Scale Leves at the same level, and assuming I get the bonuses give:

252,599 x10 allowances

So why would I ever waste 10 allowances on that when 10 normal leves will give me: 1,683,990 exp ?

I heard about the amber thing I guess, but non appeared/dropped and the only thing I can see that I can trade amber for is dumb accessories. I have to be missing something.