It appears they replenish after a while - I had the usual starter amount, went down to 3, and now I've got eleven... sweet.Seems like when the invites run out, they don't refill like Gmail use to.
I'll part with 2 more in that case. PM me with your email if you want one (but PM only one member at a time and wait for response please)
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EDIT: I made my own menu bar icons for DropBox as well... some simple text ones and then a set of simpler 'badge'-style icons.
Copy them into: CTRL-click the DropBox app > Show Package Contents > Contents > Resources. Just backup the old ones first in case you want to revert.