HI there everyone.
For reference, I do not work for Paypal now, but did work for them a short while. I am not handing you top secret information here either, but a general dose of common sense.
Paypal like any company, is trying to minimize 'fraudulent' transactions. Let that sink in for one moment. They do not keep tabs on what you sell or who you sell to. What happens is that they will periodically check you are a legitimate person and request your identification like Passport, which they have done recently to myself as well. That is one way to check who you are. Other ways they do actually keep tabs on fraudulent activities are through how much money you obtain in any 30 day period. If like most people, you happily go along with a normal Paypal account and all of a sudden decide to be an affiliate and make tons of money or expect a fair amount to go through your account in the days that follow, you may want to pick up the phone and talk to Paypal support to explain your circumstances and how you plan to run a business. That right there is common sense. Alert them to what will happen and they will keep an eye on your account, and may even still require authentication on your part if they feel something is not right. There are countries that are considered higher risk than others, so think like a business whose primary concern is the safety of their customers and transactions. They only want to ensure everything is fair.
Paypal, will also suspend accounts linked to eBay if you sell items, and not adhere to their terms of service in relation to refunds or items you sell, example: Items as not described where the person opens a dispute. After a few disputes, you will get into trouble.
This is all common sense and tons of high-end companies that even host contests these days, will sometimes say in their terms and conditions that they do not deal with some countries, due to the influx of fraudulent activities that take place.
Heck, when I worked for another game company (actual game, not gambling) as tech support, they had a round number of $5000 which would trigger account suspension and investigation. So, at what point do you think a company like Paypal may not have the same thing in place? Think about that.
People need to think about what they do and not just assume it is their right to have their money. People try dodgy things all the time, so companies like Paypal will look after themselves and their customer base first and foremost.
You wonder why I quit Paypal... company was great... I just do not have a head for complicated search systems to obtain information. It is the one thing that has me quitting a company faster than anything else. If the UI and system is not designed for ease of use, then I walk. I hate having to muddle my way through systems just to find out how to help a customer within the allotted time frame they offered.

I think over the years, Google has somewhat spoiled me with its beautiful search. In that way I love Google so much, and get really disappointed when I work for a company who do not tag customer support articles properly with keywords. It slows down the workplace, people get frustrated as they can't find the right solutions and then customers get angry when you ask them to 'hold the line' for at least 7 minutes or more, looking for this information. My ultimate goal one day, is to create a super friendly user system a company can use. Which is why I ended up doing a foundation degree in graphic design, digital design (UX/UI) and advertising. Now I am doing my Honours degree at University. Either way, just know I am motivated to make a change, and absolutely dislike badly designed information portals.