That said, you say your market is:
"Lofty AI is best for people who are: 1. Thinking of buying their first home, but are nervous about losing money. 2. Looking for higher returns than normal by buying properties in an appreciating neighborhood early."
1. I wonder if people who know they have to sell in the next three years, but don't want to sell today (e.g. a work move) are also a target market. If I know my job is going to move me in 2 years, I might like to use your service to retain 80% of the upside, but insure against downside when I sell.
2. I once read a book about real-estate investing, which said that the real way you make money is to buy rental properties with poor cash flow, 'fixup' the tenants to improve the cash flow, and then sell, repeatedly. I wonder if your appreciation-potential-evaluation/downside-insurance model applied to rental properties for sale, combined with coaching/tools for aspiring landlords, might be attractive.
It seems like right now, you are primarily using the purchaser as a source of capital, and other comments are saying "why don't you just raise the money yourself?", but if you were also using the purchaser as more like a franchisee, someone who is actively working to improve the cashflow of the property by upgrading the tenants with your (automated) advice, that might create a more interesting relationship where you have more room to add value (its more complex to analyze multi-tenant rentals, its more complex to choose high-potential landlord partners, etc).
Random thoughts. It's a very interesting idea, very original.