Earlier quoted context omitted.
The tough thing about running a maker community is makers don't want to sit around all day to browse products and comment. But you know who does? Growth Hackers. I say this coming from my own experience growing a community of hardware hackers who have even less of an inclination to chat since they aren't always in front of a computer.
You just hit on one of the fundamental reasons why all online communities tend towards toxicity – the people who have the most time and energy to invest in discussions (which eventually snowball into flame wars) are the people who aren't actually doing the actual work. These things then feed off of themselves – in a sociopolitical 'guardian' type community (/r/atheism, /r/childfree, etc etc) it ends up becoming highl…
Also there are communities around conventionally caustic topics (eg. Lambda: The Ultimate for programming language design, Penny Arcade for games) that manage to survive for a decade+ with no loss of quality because of moderation policies. For example, L:tU has an "avoiding ungrounded discussion" policy - every thread must be centered around discussion of a published academic paper, which first of all keeps the focus on people who actually do work, and second of all discourages everyone without the background to read and understand academic papers.