With all due respect to all AAA-professionals here: Are you actually really planning on making an equal living, or at least part of it, from UE market place than you would by working at a larger company or at least not as freelancer?
There are like hundreds of professionals. Tell me, why did they not have the same brilliant idea. Hundreds, thousands of people with your skills. Though, you are only clever ones…
In the end, you can take it for granted: The prices will go to Unity Asset Store level.
UE4 marketplace right now is really thin of products. A few more months, (hopefully finally) many more assets on it and $125 items will not sale anymore.
I do not see any reason why UE4 marketplace should be any different than Unity Asset store, unless you keep it ‘excusive’ like at the moment, i.e. almost nothing on it.
I searched for car, offroad cars…there is like…nothing.