So yeah. According to my turn of mind, a few sats is a price I'm willing to pay, even if I don't charge anything.
![Smiley](https://bitcointalk.org/Smileys/default/smiley.gif)
In theory, if you can get your fee policies balanced well, you could get channels to always be balanced due to not being overused in one direction compared to the other; thus always being ready to use (for payments and invoices as well as routing attempts).
Today I went ahead and manually balanced all my channels (which also cost a few hundred sats in routing fees) and immediately routed 6 payments over the day, after weeks with barely any activity.