since you are using paypal privately with other users for any service you are not technically violating paypal terms.
"Prohibited Activities
You may not use the PayPal service for activities that relate to transactions that are associated with the following Money Service Business activities: currency exchanges."
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http://cms.paypal.com/us/cgi-bin/?cmd=_render-content&content_ID=ua/AcceptableUse_fullThat is pretty cut an dried. They may not know the purpose of a payment, but that doesn't mean the transaction doesn't violate their terms (acceptable use policy):
Currently what are U.S. users doing to get money in and out of USD? It seems like an incredible pain in the boot with excessive fees and middlemen no matter how you go.
The most convenient method might be to just mail a check.
ExchB:
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http://en.bitcoin.it/wiki/ExchB and HelloBitcoin:
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http://en.bitcoin.it/wiki/HelloBitcoin Both will accept a check by mail for deposit of funds into your account.
For withdrawals, both will send you a check and both provide a way to withdraw funds directly to your bank with ACH.
Of course, if the delays are ultimately the issue, mailing a check is no faster and may even be slower. Sending a bank wire then is still about the only way to be able to get to trade on those funds within about a day.
You might find someone to trade with locally:
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http://en.bitcoin.it/wiki/Category:Directories