To strike "on topic" conversation back up here, I'm looking for some numbers which people think would be the most logical for siege costs in the format suggested in the OP. There's a lot of things to consider such as different age maps, costs per siege related to sector power etc. My personal opinion is that a siege shouldn't cost more than 500 goods to avoid stalemate situations and keep GvG active so I'll start with 500 as the top siege cost for what I think would work well.
Working from modern era power ratings of sectors a top power sector (96) would cost 500 of each good. A minimum power sector (32) would require 3 sectors to be taken to make the equivalent of a top power sector however this would obviously cost more units for the attacking guild and also more time and effort. To balance that I think that taking 3 minimum power sectors should cost less to siege than a single maximum power sector. So possibly 100 of each good for a minimum power sector (or somewhere in that range).
There are then the 2nd lowest power sectors (46) which would require 2 sectors in order to be equivalent to a maximum power sector. Again, costing more units, time and effort to take these sectors than it would to take a maximum power sector would mean, in my opinion, cheaper goods costs to create balance. However it would be cheaper on units, time and effort to take 2 of these sectors than it would be to take 3 minimum power sectors so the cost must be higher. A goods cost of around 200 per siege seems like a fair amount costing 400 goods to gain the same amount of power as a single maximum power sector (500 of each good) and 3 minimum power sectors (300 of each good).
Then there are the second highest power sectors (64). To take 2 of these sectors offers more than a maximum power sector which would mean a higher goods cost required, however it would also require a small amount more units, time and effort. That being said, a cost of 300 per siege seems fair in my opinion. With two sectors costing 600 of each goods being 100 more than a maximum power sector, that would take into account the extra power gained. However not being too much more would also take into account the extra units, time and effort required to take two sectors rather than just one.
Costs per siege would be:
32 Power = 100 of each good
48 power = 200 of each good
64 power = 300 of each good
96 power = 500 of each good
Again these are just example numbers that would make sense in my opinion. Possibly need tweaking to reach more exact and balanced costs and possibly a wider range. Up the maximum power sector to 600 or 700 to create a wider range of costs however anything more than 700 definitely becomes too costly.
Also something to consider would be costs being dependant on other factors such as how high or low the defence on the specific sector is. There are a lot of different things that could be taken into account but personally I'd rather keep it simple. If you have other ideas then feel free to share them
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Let me know what you think of the numbers and when we can reach a widely agreed upon range of costs I will add it into the OP