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When spiders make a web in a spot that doesn't catch much or is disturbed often they (usually...depending on the type of spider) will recycle the web material (usually by ingesting it) or abandon the web entirely and move to a new spot. When they find a spot that "works" they will stay there. Therefore you often see spiders with webs in spots that generate a lot of food and are unlikely to be disturbed. They really aren't that smart or intuitive they are just persistent.
I just made all that up.
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