This is very little problem, because this is only with 64x64 start map.
Any new map don't have this problem.
In 64x64 start map, maintenance cost of bus stop shows as 50.
If bits_per_month is 18 (default), it should be 20.
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Default map now starts with all default values to ensure a consistent setting. Not sure if this is goodor not.
Then, what is 50 ?
bpm 18 = 20
bpm 19 = 40
bpm 20 = 80
Maintenance cost is shifted by bit per month setting for ages. Because convois can make double amount of deliveries, maintenance must be double too, if I increase bit count by one.
My point is "it never be 50"
bpm 18 = 20
bpm 19 = 40
bpm 20 = 80
[edit]
At last, I understand now. All value use default value and default maintenance buildings is 5000.
This is not a bug, so I must close this topic.
But I suggested in other topic, http://forum.simutrans.com/index.php?topic=812.0 , I think that "each pak set has its default value" is better.
Default value which any pak set don't use or default value which is different from pak set default value is meaningless.
Anyway, it's not a big problem. :)