Though you can perhaps find an angel type investor who just happens to be sympathetic to you or interested in your particular industry for his own amusement, most VCs are not interested in a fair fight or in established industries. They want an untapped market (or some proof that you are going to completely disrupt an existing one) and/or they want some very unfair advantage that you have over any potential rival.

That could be some technical innovation or some coming together of highly visible previously big winners in a way that can be used to convince the world that you are unstoppable in some way, or some already large company with the visibility it can use to leverage its way over the existing players, etc...

That seems sort of a long stretch for the home automation market, right? At least in terms of the integration business. Of course if you can invent a thermostat that films your every activity and posts it real time to your social media account, then you could sell out for billions.

In the area of technical venture capital, a 1 in 10 (or lower) success rate is pretty common, so the 1 winner has to pay for the 9 losers. So they want every one of them to be potentially a big winner, and they want a very big cut of the pie (unless you are an already very successful player or have a VERY good story that multiple VC firms are bidding up.)