I created a post on the forum:
which got some interest but fell off the mainpage after a few days. I figure it might get more exposure here on the new sdk q&a area.
If possible, I think it should be standard practice for devs to create a free lowpoly version of their paid aircraft. Some mentioned using the isAirTraffic=1 and isUserSelectable=0 flags.
Also any plane currently in the marketplace should automatically have the free lowpoly version of it as part of the base package.
The bonus is people will see your planes flying around instead of Bonanzas and will want to buy them!