Be somewhat honest with the kid. Let him know you love chatting with him, but you're over sensory (or whatever your particular issue is at the time) at the moment and you can't give him the attention he deserves right now, but you'd love to hear about it later.
Kids are smarter and notice more than you think. Being honest and open about your issues is healthy for both of you, and helps show the kid it's ok to not be in the mood to talk to someone and a kind/polite way to disengage.
No, getting paid by bankers is ABSOLUTELY a problem. Or did you forget what the bankers leading up to 2008 after they got beneficial legislation passed that let them fuck up the markets?
Bankers buy politicians to let them fuck up the economy and drain more money from everyone else they can.