I've never paid brokerage on anything shipped from an individual to me. The only time anyone at US Customs has ever really spent any time is when I've brought vehicles back into the US. The worst was a Honda quad and that was sorta funny because my buddy bought it from a friend of mine here in the states. Imported it to Canada, kept it a year, I went and bought it back and the US board agent was having a slow day and I got the run around because the frame had been powder coated several times and the stamped vin tag was hard to read. Look, I've got the original title, the Canadian Import paperwork a bill of sale from both the current and previous owners and I KNOW both of them here are their phone numbers call and verify. Then when something more interesting pulled in bam, just leave buddy we need the parking spot.
Taking stuff into Canada I've had a lot more trouble. But it really just depends on the board guy. I've gone up with 20k outboard, trucks, engines, etc. and hardly even a second look, and I was nearly stripped searched for a set of BEAT aluminum 16.5 truck wheels I gave the guy. That was about 4 hours and 5 agents and they charged me 26 bucks US tax. Really? Think that was a good investment of time?
Go figure.