Why do I think sellers should control the system? Please tell me you are kidding. You can be serious.
Try this sometime, walk into a car dealer or a supermarket or any store and tell them how they shoud sell their product and operate their business. Tell them that you the buyer should control their business and the system. let me know how that works out ya!
BTW, the std purchase agreement is so heavily in favor of the buyer. Its not even close. Buyer takes control of property transfer right and can walk for no reason with no penalty while seller has taken his property off the market and potentially missed out on another opportunity to sell.