I asked myself that question, and started asking successful aircraft brokers.
Aircraft brokers, on average take a 1 % commission (realistically), depending on the size and marketability of the aircraft.
So suppose that you’re selling this aircraft for example,
a Dassault Falcon 50, Year 1994, TTAF(Total Time Airframe) 6,855 hrs. -it was listed last year at $2.5 MM. Full details here. Comission: $25,000.
Note: Video below may be a different aircraft.
For most important considerations to aircraft purchases, I recommend reading NetJets Buyers Guide
Arguably the most qualified and reputable brokers are NARA (National Aircraft Resale Association) certified and adhere to NARA’s Code of Ethics.
As long as you are a good salesperson and can articulate an interest in private aviation you should be able to sale planes. List of brokers http://www.businessair.com/aviation-business-directory/aircraft-dealers-and-aircraft-brokers. Keep track of those manufacturers that have ramped up production (Embraer in Melbourne, Fl, Cessna in Wichita, Ks). A lot of brokers are located in private aviation hubs (airports)
I'll pass. I make more than $300K at the moment. I'll need to wait at least 5 years until I can scale up to my level. Cost-benefit analysis.