And then they go on to describe how they refuse to kowtow to the obviously made up "needs of paypal's anti-fraud division".
There are lots of reasons to get mad at paypal but all too often the formula "We understood nothing about business, didn't even bother to familiarize ourselves with the law or financial regulations, and somehow problems resulted! We blame paypal!" is repeated all too often.
Let's look at this from the flip side. You decide you want to defraud a bunch of people, so you gin up a fake conference, it's easy to put up a fancy web page and sucker people in, then you take the money and run. You think this doesn't happen?
Paypal does have pretty crappy customer service, but if you expect to accrue a significant fraction of a million dollars in a paypal account and you don't think that somehow there might be some hoops to jump through then you are living in a fantasy world.
There's a reason why there is a lot of markup in event ticketing agencies (such as brown paper tickets, or event brite, or the hated ticket master), and it's not because it's such a fundamentally easy problem.
Edit: I'll say this again. It sucks when people who are working based on perfectly good intentions get hurt by the system but we live in a heavily regulated era. Expecting that you can operate a business without taking heed of the relevant regulations and business rules is massively naive. More so, it's a disservice to your customers. Imagine that you were running a 100% cash business. It would certainly make some parts easier, but don't you think people would start asking questions?