A "good faith" deposit is otheriwse known as "earnst money" at the time you make an offer.
Although, it is not absolutely required for a valid real estate offer or a contract, an earnest money deposit from the buyer(s) customarily accompanies an offer to buy real estate. The amount, a small fraction of the total price, is listed in the contract, with the remainder of the cost to be paid at the closing.
There is always a risk, though small, that a buyer could loose this deposit if they do not fulfill the terms of the contract. Seller often do not keep this money because it holds up the marketing and subsequent sale of their home. Some seller realtors view a larger "earnst money" deposit at the offer as the buyer showing more serious intent to buy.
This may be a better stragety for a buyer to use in a seller's market, not a buyers market.
I hope this helps you make an informed decision Eessary.