If there wasn't only one raid, that you need to do multiple times to get all the gear. At least 10 times if you want full raid gear for 3 characters.
If people need to do something over and over again, they're going to find the quickest way to do that.
You can run the raid for rewards once per week on normal and hard, on each character, so a person could be doing the raid up to 6 times a week. That will get repetitive.
By the time you've done your third run and still have no raid gear, people get tired of it and just want to be done with it.
TL;DR
More variety = less searching for exploits.
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But, that doesn't mean we should exploit it.
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I cosign this!
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Well hopefully they have an idea to come.out with new raids in the expansions. Borderlands 2 considering it was only a boss had a new raid boss with different rewards with each dlc.