Earnest money deposits are not legally essential to an offer to purchase, however, the buyer's earnest money deposit tends to dramatically increase the likelihood of closing. The seller is more receptive to the Offer to Purchase and the buyer is showing their commitment to the sale. Earnest money deposits of ŭꯠ to บꯠ on smaller transactions are typical. As a rule of thumb, the earnest money should be 10%┫% of the down payment.
I completely understand the smoke_and_mirrors dance producers have to perform to bring all sides to the middle, but when it comes to key talent attachments, if it's not verifiable, it doesn't exist. Bottom line, ditch the letters and let us pick up the phone and verify Mr. Jackman.