The dif between a product price of $1,998 and $2000 may not be much, but it can make a difference in the minds of buyers, and even affect purchase decisions.
You guys probably know ... Level, even prices (e.g. $2000) can make a product seem more prestigious. Prices ending in "99", "97" and "98" make a product seem more affordable and more of a value. Prices ending in very specific numbers (eg. $57.87) convey that you've thought hard about the price, calculating the product's true value carefully (and authoritatively).
...but what about when it comes to quoting prices for your copywriting services? Do you use psychological pricing at all?