Back in the 90s and 00s, lots of companies churned out software products that were sold once, supported forever. It was a sort of Ponzi scheme, supporting old customers with money from new customers. Which was okay during a period of high growth. But sooner or later the market matures, growth plateaues, and the cost of ongoing maintenance becomes a much bigger problem.

Right now you're growing fast and swimming in VC money, so this is probably not an issue. At some point, though, you might find that even hardware depreciation cycles don't provide as much of a cushion as you hope they will. In an economic downturn, people might suddenly realize that Oxide hardware actually remains serviceable much longer than they expected. :)