Potential scam, or very smart scheme

I gave monerowebminer.com a shot after being told by a few people... Running it on 3 pcs and 2 tablets. Using the same account for all of them I see this. <br><br>

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So I am wondering how I am getting 3 separate amounts mined, to make things worst it requires 1 monero for withdrawal... I may not be the best with calculations but you mining even on 10 pcs would not reach this for months. It may not be a scam but knowing people are notoriously impatient this pool/app is utilizing that fact to gather the forgotten coins mined from suckers.
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Please prove me wrong here

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