I sold my home with a Hubitat hub, a Hue Bridge, and a Lutron Smart Bridge Pro, but for two reasons.
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My agent and their team thought it wouldn't hurt the sale (good advice to consult with your selling agent), but they didn't push the fact that it was a smart home, and only mentioned it at the very bottom of the listing. The agents didn't understand smart homes at all. It was a crazy market, and the fact that it had smart lighting probably did very little in hindsight.
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Adding smarts helped me. I needed to have ceiling lights and a center light, invidually switched in each of the bedrooms. Copper wire was expensive, time was short, and the effort in a house built in 1926 was high. I had already rewired the entire house, disconnecting every last bit of knob and tube wiring, when the designer sprung the bedroom lighting requirement on me. So using Picos and Hue bulbs for the center lights was much faster and easier.
I changed every other switch in the house to a Lutron Caséta dimmer. That in hindsight was probably a waste of money. The house had Yale YRD256 smart locks which I left, but I removed the Z-Wave modules. Also took my Nest Protect smoke detectors and replaced them with regular smoke detectors. Left my Ecobee 3, Ring Alarm and Delta Touch20 faucet, but removed the VoiceIQ module. No other smarts in the house, just lighting. If I was to need to do it again for the same lighting situation and time/effort savings, I would. However, I would take absolutely everything else and would have put regular dimmers throughout.
I've not seen in the house since we left, but I later learned that the very high price they paid for our house, wasn't a very big stretch for them. They replaced the doors and locks, so both keyless smart locks are gone, and I heard from old neighbors that they did a lot of work inside (we had just completely renovated the house with a very in vogue style and they apparently changed most of it). My guess is the smart home stuff I left for the older couple that bought our house may have all gone in the trash or into someone elses hands. 
Bottom line is, you cannot know who is going to buy your home (unless you are the seller and agent), and you'll never know their true intent until they do it. It's their home, forget about what goes on after you sell. I too thought I was going to give them a guided tour of the smarts, but in the end it was a whirlwind process, where we had very little contact with them. The two times they came in the house after the sale (as was allowed in the terms), they only cared about taking measurements for changes they were planning to make. I did create a detailed printed guide that explained everything and showed pictures of where the smart switches were, what they controlled and how to use them. Even pointed the guy to this forum for friendly help and answers. Maybe I'm wrong and he's here as a memeber, using Hubitat and expanding on it, but I suspect that's not the case.
I will add that utilizing the years of experience and essentially desiging a near bullet-proof smart lighting system for the new buyers, taught me a lot. I used that experience to convert our current 1986 home from a 3-way lighting maze, to a very solid and user-friendly smart home. None of the overboard smart stuff that our old home had, and consistent dimmer brand/type throughout, with many stratigicly installed Picos and very descrete, often completley unnoticable motion/occupancy sensors throughout.