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
Season 15 - Level 15
League Winners (14) - Levels 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14
26-0-0 league (4) - Levels 3, 4, 7 & 8
Undefeated in league (11) - Levels 3, 4, 5, 6, 7, 8, 10, 12, 13, 14
Cup winners (2) - Level 1 & 14
Cup 3rd place (1) - Level 12
Champions League Winners (10) - Levels 2, 3, 4, 5, 7, 10, 11, 12, 13, 14
Champions League Runners up(1) - Level 9
>My team<
I think with natural skill point growth, your player will most likely be an active player in your side for at least the next 2 seasons, you can expect him to still be around the 6* range for sometime as you go up the levels, I think when your at the start of level 6, he will be around a mid range 5* player but 26 years old, and even if you decide on his successor at that time, he could still be sub/reserve for 1-2 more seasons, on my old regime, he would probably be sold around Level 7-8, obviously the power training means he will stay one of your stronger players for a little longer than level 7-8.
At level 2, Unless you want very easy wins, power training is not really the worth while. I would strongly suggest Level 10+ where you face more active managers and stronger 5* or even the odd 6* scout buyer.
*Retired From Top Eleven*