Producers are not in the business of self-sacrificing philanthropy. Why should they risk everything on unknown work when they can pick up successes from the subsidised theatre, thereby lessening the risk. Even when they do chance their arm, it only takes a heatwave to make the audience figures slide beneath the break-even point and for shows to close.
Thus it is good news to learn of a direct link between West End management and subsidised theatre, with Janet Holmes a Court of Stoll Moss Theatres sponsoring the Verity Bargate Award. If you can't risk producing brand new scripts, then at least you can help discover the talent and nurture another generation of playwrights.