What I think Alice will be interested in, is not so much how it affects the balance of the channel the tx is routed to, but how it affects both “to” and “from” channels, and how these compare to her overall node balance.For example if Alice’s node has a combined balance in all channels of 80/20 (meaning she owns 80% of the combined channel caps), then she should make txes that push the involved channels towards that ratio cheap, and the ones that push away from it expensive.

Also, say for example:
* Alice has a nice overall balance of 50/50 (read as: [what she owns]/[what her channel partners own] as ratio of the summed capacity of her channels)
* She has an unbalanced channel with Bob that is 20/80
* She has an unbalanced channel with Charlie that is 90/10
If she routes a tx from Charlie to Bob, pushing both channel balances to 85/15 (15/85 for the channel with Bob) – should this be an expensive tx?

I think this tx should be neutrally priced, or even cheap if we consider that a 90/10 balance is probably worse/more inconvenient compared to a 85/15 channel than a 85/15 channel is compared to a 80/20.If she only looks at how it affects the “to” channel she would punish this tx for no good reason.