i guess it all depends on what the actual value of a pod is. Since they never said how much it is we will never know. All we do know is that its about equal to one slave.
but more importanlty it's mesed up that No one decided to go back and buy his mom.
True but no one would willingly want to buy a pod that would be worth a slave. Well...maybe a Hutt, but a Hutt didn't buy it it was Sebulba.