If you have a resource which you definitely need a lot of for your strategy, spending 950 gold to raise the province morale, first thing the minute you join the map before doing anything, has a huge impact.
For at least the first two days, and probably more if you're not capturing many capitals early, the morale there will be much higher than it would have otherwise been.
Resource generation, money income, build times, and manpower generation are all improved.
Day 1:
Assuming you build Industry level 1 here, then onto Industry level 2 (8 hours + 14 hours). Your resource income maximum starts at 6000 and increases as industry builds up to 25%, more at the very end of the 24 hours if you can get 2 hours into Industry level 3. 0% industry to 27% industry, 6000 -> 7620 or so, average 6810 Day 1.
Without the morale boost it's only 0% to 24.3%, 6000 -> 7460ish, average 6730 Day 1.
Same for money, and about 681 for manpower. You finish with level 2 industry at 22 hours with 80% morale instead of around 25 hours with 70% morale.
So add 10% of that potential because your morale is 10% higher roughly. 80% of 6810 instead of 70% of 6730, 737 extra resources, money Day 1, 73 manpower.
Day 2 these numbers go up as well as Day 3, as your industry raises the resource maximum. Perhaps I should track these numbers from this one city with morale increased from the start, comparing it to another city with normal morale. The morale difference isn't quite 10% again on day 2 on because being closer to your target morale you increase less quickly versus starting at 70%.
Once you capture your third capital early the differences are moot, and after the second the differences are small, but that takes a while for most players/most strategies.
Day 2 let's estimate 8% higher, and day 3 6% higher, and maybe you capture a second capital near end of day 3 to bring it up to 100% anyway.
Day 2 potential 27% - > 45%, average 37.5% because you finish level 3 well before day end. Let's say you run low on resources for upgrading industry, and top out at level 3 for the first 3 days, even for your most important resource. So 8250 day 3 average (6000*1.36) with boost, versus 24.3% to 45%, about 35% increase average without boost, 8100 maximum. 86% of 8250 vs 78% of 8100, 777 extra resources Day 2.
Day 3 works out much the same, around 786 let's say, less morale % difference, but biggest resource maximum that it modifies.
737+777+786 is 2300 extra resources, 230 extra manpower, 2300 extra money, and having your level 3 industry done earlier so you can start another building earlier, all for 950 gold. That would cost you 1150+115+460, 1725 gold to get normally. Almost twice as much bang for your buck, spread out over the first 3 days, and this is your critical resource that you need for your war machine. Or the resource that the market wants most early on, either way puts you in a strong position for roughly just 1/3 of the gold cost of the free gold for watching a few minutes of ads day 1.