Roger that. Selling used gear is pretty tough just about anywhere. I definitely see your point. Setting up as you described could definitely work, but it also might not. Do you have any test equipment? Even a simple spl meter(everyone should have one), can help find the best spot, and help with balancing the system. Rew(room eq wizard freeware) and a measurement mic will definitely help get to the next level of setup but the learning curve can be pretty steep.
With a big open space and that big of a price tag I sure hope you get the performance you’re looking for!