This might be a bit of a dumb question but I'm unsure what to do with my tokens. Currently I'm (13 XP away from) level 10 and only really use tokens for the occasional staff hiring or if I run out of engines. My money is very gradually lowering, so I know I want some tokens saved for when/if I run out of money so I can get some more cash. However, I have almost 90 tokens, which would equate to over 75 million dollars - More money then I could dream of spending in months.
So, my dilemma is, should I continue to save tokens? At higher levels, do they get used more? Or should I use them to speed up my HQ upgrades?