My guess is that such expenditure is not in your marketing budget to potentially gain just a single customer.
But you may be risking penalties of that caliber or more, per email, if your transmissions do not comply with the CAN-SPAM Act (United States)….
If I had 50 cents for every time I heard, “I knew that this client was going to be trouble!” I would be vacationing at a seaside resort−for the rest of my life!
In case your gut told you “Don’t work with this buyer” and you look at your bank account, which is screaming “You need this!” here are some warning signs that this isn’t the right customer for you.