The use of the subjunctive mood is often chalked up to how the author is feeling at the moment. At this point in the sentence, she is delivering a statement. The future tense that you would expect from each benefit listed immediately follows the statement.
We have to allow for her use of the subjunctive mood because that was apparently her feeling at the time. Had she used indicative mood 'da', it would have only indicated a different feeling on her part. Nothing more.
The future tense 'dará' would not be expected in the statement portion of the sentence. As mentioned earlier, the future tense immediately follows the statement.
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