I think the first 3 are nice to good names, but still hard to make a domain sale without development. Earnings.co.in is good for development, because people are always interested in salaries. So, this domain has traffic potential, and you can then advertise for the high profit recruitment industry. The problem is, all this is a lot of work before you see money. So, the development potential is there, but they are still hard to sell domain alone.