Offer the first year of support with the theme and make it possible to update ALL plugins (including WP Bakery) without a huge hassle.
Then give us the choice to pay for another year of support, but still make it easy by allowing updating of plugins through the dashboard.
This business of keeping WP Bakery up to date is a HUGE inconvenience, support or no support.
Make it EASY and the $$$ will flow in. I would have probably paid the annual support fee just to keep the theme updated through the dashboard.