One suggestion to sellers: there is nothing sacred about a minimal deposit; you can ask for more.
A couple of years ago, during the pre-resale restrictions buying frenzy, I got an offer from buyers located in another country. I asked TTS what my options were to protect myself against the buyer changing their mind (sometimes happens with overseas buyers because of differences in legal systems, costs of getting documents notarized, etc.).
They suggested a $1,000 deposit, rather than the normal $500. A little more skin in the game makes it less tempting to bail out.
Our buyer submitted the deposit as requested, we both handled the paperwork quickly like adults, and the closing went through without a hitch.
The purpose of a deposit is to ensure performance by the buyer. The seller has a much bigger hammer over their head -- if they breach their contract, they owe the broker their 10% commission.
A larger deposit does not increase the buyer's cost of purchase one penny, but it does provide some additional incentive to go through with the transaction as they contracted to do. If the buyer declines, that should tell you something and it's time to move on to a better buyer.