No matter what price you sell at someone will always try to underbid you. look at what you can get for $1 in the hosting market.
Better to price things reasonably and stay in business.
If it costs you $5 and you sell 100 at $4.99 then you are out of pocket $1 plus your time and effort doing all the accounting.
If you sell at $10 sure you may only sell 10 units but thats $50 profit and you have only spent 10% of the time doing the accounting for it.
Take into account all the incidentals 3PP fees (cost per sale), your time what thats worth.
You may gain 100 new customers and it only cost you a dollar on the face of it but if price was the only thing that keeps them then come renewal they will look elsewhere. For those customers who purchased for $10 even if you only keep 10% of them you still make more.
For domains some people are still willing to pay more than $29.95, here in Australia you can purchase .com.au for $55AUD (2 years) but some people are still happy paying $70AUD/Year for a .com and $140AUD (2 years) for .com.au go figure
