Initially, we had the opportunity to buy the inverters directly from Luxpower at a much better price and I turned the offer down.
I was interested until I found that EG4 has specific (exclusive) customizations, such as proper hand-ties on the breakers (very important for code/safety), a properly sized wiring compartment, UL9540 with reasonably priced batteries in the works, and to top it off a much bigger pull on Luxpower to get firmware issues fixed than if I was doing it on my own. EG4 also has much higher product turnover so any revisions come through to the end consumers far quicker than if I was doing a container at a time.
Our mentality in business is to provide solutions to our customers, not just lists of products that suck or have shortcomings...so why take on all that financial responsibility to offer a lesser quality inverter that hasn't had all the important fixes applied, just to save a add a few bucks in profit? We rather carry the best products (and versions of it) possible so our customers are taken care of as best as possible.
We also are signed on with Fortress Power and can list their batteries and version of the same inverter if we wanted to...but has anyone seen the price on the Fortress batteries lately? To be certified to UL9540, you have to pair batteries with inverter, so by buying their inverter you are stuck with their batteries to be code compliant.
I wouldn't sleep at night upselling a customer a battery/brand that costs twice as much as it should, which adds no benefit over the EG4 option and has a FAR higher self consumption (I forget how many watts per battery, but there is a long drawn out debate thread on this forum). At those prices, it's a money grab, not a solution...and solutions are all we care about.