The main disadvantage to equity financing is that company owners must give up a portion of their ownership and dilute their control. If the company becomes profitable and successful in the future, a certain percentage of company profits must also be given to shareholders in the form of dividends.
A company provides you with a lump sum in exchange for partial ownership of your home, and/or a share of its future appreciation. You don't make monthly repayments of principal or interest; instead, you settle up when you sell the home or at the end of a multi-year agreement period (typically between 10 and 30 years).