LOL, Not another one of these. If you're planning to sell a domain for $500 or more, reg fees are hardly a consideration. The kind of people who'd choose to pay $8 v/s $15 are not my target audience.
And if .co.in is so popular, how come most of the sales are for .in?
If anyone wants to know why .in over .co.in, please read my next blog entry later this week.