Here's what's coming to address this, possibly later today:
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Basically, missions are just not well balanced in terms of the rewards they give. What I'd like to be able to do is tune the types of rewards that missions give in the following groups:
1. Really commonly-needed crafting materials (to be determined): 35%
2. Rarer crafting materials (anything not in #1): 15%
3. Guardian power scrolls for affecting the macrogame in major ways (wind shelters, buoys, seek survivor missions, seek resources missions): 20%
4. Guardian power scrolls for other things like continent-wide buffs, etc: 20%
5.a. Guardian power scrolls for building the basic 7 building types: 10% until such time as all 7 basic building types are found, then 0%
5.b. Guardian power scrolls for building personality buildings: 10% after all the basic buildings are found, but only if on continent 2 or greater (aka personality buildings unlocked).
5.c. If all the basic buildings found and the personality buildings are not yet unlocked, then this 10% instead gets split with 5% to #4 above and 5% to #3 above.
Given that we are giving the first four buildings to players for free on continent 1, and that on continent 2 they will have a huge number of missions available to choose from at any given time, this should work out such that people can still get what they need a lot of the time. It also should prevent players from getting tons of stuff they don't need in a frustrating way when it comes to personality buildings.
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When it comes to missions spawned by Seek Resources, they would continue to operate under the rules of just giving resources, I'd think. So just a mix of 1 and 2, at the same relative percentages I'd imagine.
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When it comes to secret missions and their rewards, I'd think that the overall percent chances would hold, except that we should exclude #5 completely. That would give us more of a focus on 1-4, which is what most people are likely to need to "shore up" most of the time, I'd think.
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Lastly, with that logic we put in a few releases back about making sure that a given mission type was never more than 33% of the missions on the world map if it could be helped, I think that should attempt to do it by mission category instead -- so all JTP missions count as one for these purposes rather than having each variant potentially being able to fill up the world map still with 99% JTP missions of some variety. I think that is still biting some people pretty hard.