The risks as an affiliate/ Affnetworks not paying

[Hadomi]

I am going more and more frustrated on the payout morality of some networks.

Last month i had the problem with yepads. AM talking things that were not true but at the end I got my payment and the next payment arrived automtically net15. So far so good.

After that I thought i try more traffic to another network. (Keyaffiliate/Fortuna) Now I have more problems then before. Normally at chats they told me that my first payment get out 15th June.
Nothing!
Till then i have heard three new dates for my payouts. On 15th (july) AM told me that now everything was sent. And what: nothing arrived :-(
Yesterday he told SORRY and that payment was now made manually. I hope to get it now finally in the next days but this all makes me really scared to scale anything.

Is this a Casino vertical problem? Do they just not pay you when they think after some weeks that your traffic is not good enough but on the other site my AM says: "Can you scale this?"

How many affnetworks disappeard the last years without paying?

This all seems to me really risky.