For bigger amounts "5,637,173,898.30 bits" is obv not so clear as "5,637 BTC" Making it bold seems nice solution though, although I am not sure if the 0000 solution might be confusing for some (but imo sounds clever solution too.) Another option would be to have tooltips on all amounts with the BTC amount?
The problem was there only when I started with it. I had no idea how much 10k bits or 100k bits was in the beginning.
Honestly, it is a little difficult when some stick to Bitcoins, some to mBTC and some to bits.. I only got used to bits after I got to using Moneypot.
Edit: It is easy once you know that 1,000,000 bits = 1 BTC, lol.
But the 10 bits thing is a little complicated. The current one is better.