Why would you ever have to sign any type of agreement before you ever see the terms. When shopping for a car would you sign a letter stating that you will buy a car for ุꯠᇸ and hand them your money hoping that they give you a new BMW when they deliver to you a 1975 Pinto? No of course you would not.
LOI is fraught with many legal booby traps & pitfalls especially for the buyer. But probably the most damning reason why credible crude buyers would have little or no use for LOI in their buying dealings, is that using the LOI is fraught with many incalculable legal traps and pitfalls much of which could atimes be very costly for, and to the detriment of, the buyer, according to legal authorities and contract law experts.