I've read this somewhere "The scamers are too lazy today" http://itsupport.ca/network-inspections/, not 100% but there are some info in discrepancy to me, but any way this point is BIG that did not bring this guys 100% scam to me, is because this guys accept paypal, that mean we are in safe place, so happy mining.
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Think about this, I was doing some research about the paypal limit (spending and selling) not sure on this, but is look like $10.000, and their (hexmining) minimum purchase is $64.699.99, did not try to go forward, but if I did, in my way to see, paypal will reject the purchase and then the only option to pay is offline, hummmm well I'm out.
Good luck.