The reason behind the threshold value is that with every transaction we have a fixed tax of 0.0001 btc. For example if one user makes more than one withdrawal request a day the tax for his transactions will be more than he would actually have accumulated for that same day.
With every transaction fee saved we are able to provide one more payment to one of our users.
At the moment we are working on lowering those limits and in the near future they will be removed as a whole.
And for full disclosure we hereby provide our payouts address: 1JCXSd9L8iznXF71MX7gcQ9V5mfV19pdYt
Hope this clears things out
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