For seven years after its inception, Amazon.com didn't report any profits. The difference, however, was that they offered a product that was in great demand, in fact, in such great demand that they experienced growing pains, which was struggling to keep up with the demand which necessitated investing in a lot of real estate, overhead, inventory and staff which ate into their profits.
MJNA, like other MJ companies, is offering a controversial product that is still deemed illegal in many states, they offer products that are very expensive, unlike Amazon who offered products much cheaper than what you could get in a physical storefront.
So, comparing MJNA to Amazon is like comparing apples to oranges.