It seems that many domainers expect to pick up names at reseller prices, and they expect those to be 10% of end-user prices. How about trying some prices in between - perhaps we could call the halfway point "investment prices".
I think I'm going to invent an investment price. This will be for a name that can be added to a portfolio, and will earn some money while it waiting to be sold. I'm not sure how to value it though. Do you base it on income, and expect a return of ( say ) 10%?