My good clients that send me work based on my terms ( weekly invoicing and high end charges)  I will jump through hoops for. Clients that want to send me work based on their terms ( lower price , longer billing cycle ect...) I don't like to get involved with. When you think about it , When you take on a bad client (just because it's slow) There is a chance that work would have been coming from your good clients if we did not help out the dead beat clients.