Redknapp's latest comments come after QPR were held to a goalless draw at home to Norwich at the weekend. Despite extending their unbeaten run to five matches, Rangers remain six points off the safety zone, but Redknapp feels his new players represent good value for money.
"Everyone is going on about Samba. You will sell Samba at the end of the season if you want to sell him because Samba should be playing for a top four team," Redknapp said.
"He is a monster of a player, as quick as lightning, fantastic in the air, can play. He has got the lot and is the full ticket.
"At the end of the season, if it doesn't go well, they will go and get £12 million for Samba, not a danger. There will be managers out there who will be thinking 'I thought he was gone, but now he is back in England'. There will be takers for Samba all day. So they have not done their money on Samba.
"(Loic) Remy for £8 million, if he can come and score a few goals, he will be £12million. We (Tottenham) tried to buy him for £18 million last year.
"The two kids from Tottenham. One was three grand (a week) and the one doesn't come to a lot of money. I have not brought players in here who were s***, that we can't give them away. They are good players. The club's invested, but they will get their money back on those players.''
Redknapp maintains there is not much more he can do as the former Tottenham boss looks to plot a safe passage towards Premier League survival and next season's £75 million TV deal.
"I am getting everything I can out of the players who are here. I can't do anything more than that," he said.
"You look at the games we have had since the turn of the year and you would have taken the points we have got.
"However, against Norwich was the game when we thought we really had to try to get three and if we had scored penalty, then we win the game."