David S: Thank-you so much for providing the details of your experience on Flippa. Post reading the details, I guess I will reduce the severity of my self-imposed punishment. Instead of being banished to the gallows, I shall reduce the penalty to more discipline when noticing the 'red-flags'.
Further to your last sentence, I am wondering what suggestions you or others may have to deal with this issue? This is the perennial question in my mind. The first thing that comes into my mind is some form of leverage. e.g. Use escrow dot com or a lawyer's (client account or escrow) and have an agreed period so you can check: traffic, earnings etc.?