I wish I had 8* players but I've run out of green rest packs and I'm too lazy to click on videos lol otherwise I would power train them. I have 4 players on 7* at the moment... If I get Petersen to 8* (about 60 skill points away) then I can keep him for longer. He's not a fast trainer either (22 year old bought from scout section) so it will take a long time.
432 tokens to get him to 8* from personal trainer
360 tokens to get my 7* striker to 8* from personal trainer
It's a lot and I don't think it's worth all those tokens at this level