What I can say, is that hemp seed was/is extremely rare in 2019, with seeds going for $1-$2 per feminized, autoflowering varieties. After this years seed harvest though, prices will definitely come down a bit.
Like you said, a lot of cultivars are unproven. Yes, they will harvest seeds by October, but then they need to plant a huge test field to ensure stability and reliability. So probably no sales this year, unless someone wants to pay them for untested cultivars.