Being a U.S. user on Paypal, make sure you read Paypal's Terms of Service. Paypal prohibits use of their system for any and all gaming activities. It's not hard for them to detect it, and they can AND WILL just close your account. They can also make you wait up to 180 days to get any monies that might have been frozen in your acount if it gets closed.
They WILL NOT issue a warning. You will just go to try to open your Paypal account and find it 'restricted'.
Quoted from Paypal's current 'Acceptable Use Policy' in the U.S.
You may not use the PayPal service for activities that:
1.violate any law, statute, ordinance or regulation
2.relate to sales of (a) narcotics, steroids, certain controlled substances or other products that present a risk to consumer safety, (b) drug paraphernalia, (c) items that encourage, promote, facilitate or instruct others to engage in illegal activity, (d) items that promote hate, violence, racial intolerance, or the financial exploitation of a crime, (e) items that are considered obscene, (f) items that infringe or violate any copyright, trademark, right of publicity or privacy or any other proprietary right under the laws of any jurisdiction, (g) certain sexually oriented materials or services, (h) ammunition, firearms, or certain firearm parts or accessories, or (i) ,certain weapons or knives regulated under applicable law
3.relate to transactions that (a) show the personal information of third parties in violation of applicable law, (b) support pyramid or ponzi schemes, matrix programs, other “get rich quick” schemes or certain multi-level marketing programs, (c) are associated with purchases of annuities or lottery contracts, lay-away systems, off-shore banking or transactions to finance or refinance debts funded by a credit card, (d) are for the sale of certain items before the seller has control or possession of the item, (e) are by payment processors to collect payments on behalf of merchants, (f), are associated with the sale of traveler’s checks or money orders, (h) involve currency exchanges or check cashing businesses, or (i) provide certain credit repair or debt settlement services
4.involve the sales of products or services identified by government agencies to have a high likelihood of being fraudulent
5.violate applicable laws or industry regulations regarding the sale of (a) tobacco products, or (b) prescription drugs and devices
6.involve gambling, gaming and/or any other activity with an entry fee and a prize, including, but not limited to casino games, sports betting, horse or greyhound racing, lottery tickets, other ventures that facilitate gambling, games of skill (whether or not it is legally defined as a lottery) and sweepstakes unless the operator has obtained prior approval from PayPal and the operator and customers are located exclusively in jurisdictions where such activities are permitted by law.