As an Ex-Realtor I would strongly, but respectfully disagree with your Realtor. If this was a commercially available and installed system like what Totallymaxed's company has going then i'd say yes. On that note, I'd say yes with a twist. I don't know where you're located but with the current housing market i'd price the house without it and market the house with it. It may sounds illegal or weird but it's not. In the description of the listing i'd explain that the house is priced without the system but if the buyer wants the system it can be included for the price of $xxxx.xx (or make an offer for the automation system). If that violates any licensing laws is another topic.
There are two ways to view this and your Realtor obviously didn't think this through.
Seller: Do you really want to be attached to your house after you've already sold it? Most people don't and a Realtor looking out for your best interest (the way they should be) would never recommend anything that would cause you to remain attached to the home for any length of time after the sale, both morally or legally. Of course there are exceptions but this is hardly one of them. What if the new owners are computer idiots and they keep breaking the system? How long do you really want to carry that burden? The extra money may seem cool now but what about 2 years from now? Then there's the topic of what you're responsible for and what they're responsible for, so you'll need a contract. Now you're providing a service with a contract and you're getting paid, we're back to the licensing issue. I'm pretty sure in some states you don't need anything special to operate as a business. DBA's, LLC, etc just make it more official and carry certain perks. You'll want to be paid extra for the system and that extra price of the home may boxs out potential buyers. Most people I tell LMCE about are impressed but not impressed enough to go spend money to achieve the same. Some people will simple over look your house because while it's a cool house it is more than what they need. In this market more buyers are trying to satisfy their needs over their wants.
Buyer:Do you really want to depend on the seller after the sale of the house? Most buyer don't and a Realtor looking out for their best interest would never recommend anything that would cause them to need the seller after the sale. Most buyers would be smart enough to walk away from a situation like that. Again, you're boxing out a subset of potential buyers. The buyers would be more willing to take on a system that was commercially supported and not a home brewed setup that only the previous home owner and a subset of geeks on the internet (no offence) can support. If you say there's no support, you just boxed out even more buyers. Most people would never take on something like this with out external support or the means of supporting it themselves.
I think your gut feeling is correct and you should rip it out and repair any holes or other damage left by the system. If I were you I wouldn't even offer it unless you bought it from Totallymaxed and can transfer the support. Don't take this the wrong way, I'm totally into LMCE but let just be honest with ourselves, most users will need some sort of support. Maybe not using LMCE but maintaining LMCE.
While I cannot see any restriction on you selling on your system as a private individual to your buyer...this does not mean I would recommend it to you...
I totally agree with klovell on this. This is not one of our systems...so unless the system was professionally installed or could be sold on with an extended support contract provided via the original installer you would be well advised not to sell your system to your buyer - it can only end in 'tears' for both parties I'm afraid. Uninstall it...make good any physical repairs to the property and continue to enjoy your system in your new property.
All the best