I don't think Parler would want it. Parler's a mix of traditional neoconservatism, and MAGA culture. That represents a sizeable portion of the US population.
Voat's content is by reputation alt-right, and bald-faced fascism. It's the fringe of the fringe, and the type of content that gets you cut out of payment networks.
You vastly overestimate the value of Voat and the zeal with which anyone wants to buy it.
Though, speaking of business sense, I don’t see why Parler would want Voat. They already have their own community. If they saw business value in a forum system, they would just build it.
Voat's content is by reputation alt-right, and bald-faced fascism. It's the fringe of the fringe, and the type of content that gets you cut out of payment networks.