There is not exactly limit, but some kind of anti-farming measure. For me (it is pure speculation only) it looks like this: Every char has some counter, every hour you get +10 points to this counter, up to max 100. Every time you get some drop, you loose 30 points. Drop chance directly depends on how many points you have, but still even with 0 points you have chance to get drop, just very little one.
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For me (it is pure speculation only) it looks like this:
Every char has some counter, every hour you get +10 points to this counter, up to max 100.
Every time you get some drop, you loose 30 points.
Drop chance directly depends on how many points you have, but still even with 0 points you have chance to get drop, just very little one.