I don´t really get what you mean with the more time you use the less resources we get, where do that come from? For every adventure there is some different types of loot that varies, so at first spot you get exo, gran, salt, tit. ore, the second and third spot you get weapons, firth spot is bread, meat, beer and so, fifth is where you get refills, buildings and so. And the numbers you get is the same every time, only the first spot can varie a bit. Check this out
http://forum.thesettlersonline.com/t...-Loot-overview