Jester...
Although I prefer the depth of color and finish liquid paint provides, powder is a less expensive and more durable option for pins.
As a pro with over 20 years in the biz too, there is no way I would begin to paint trim as a business for others, as most consumers do not understand the mechanical properties of liquid paint and would be constantly coming back asking for warranty/repair issues.
Liquid paint is designed to chip to the primer layer to protect the substrate, given that, the area where the leg bolts are tightened down, the edges of the legs, and the edges of the lock down bar all will chip easily in all but the most pampered environments. That said, if folks understand that up front, are willing to ante up for the increased cost of liquid paint (materials and time), and you and your brother need an extra income stream, go for it!
Nothing rivals the depth and beauty of a nice liquid paint finish, but damn, for the money and durability, powder it tough to beat.
cheers,
rody