Manage WP could have become an industry standard but they blew it by getting too optimistic with the pricing. The entry level features are inadequate and the mid-level costs $21 per month for up to 10 sites. As it stands, 99% of their potential market are going to just bite the bullet and learn how to use multisite instead. Sure, there will always be some people to whom price is irrelevant, I am sure they will make money, but Manage WP had the potential to be truly important.