Yep. It just happens to be 10k for some players and not for their entire career as it changes with their age. It could've even been 10k for your player, I just don't think you'll ever see 5.01M displayed. Some people have even reported value supposedly decreasing when they add skill points - that's not true either. After reaching a certain number, the values are just starting to be rounded more to the left side.
The number that is added is a percentage of the player's value (I don't think anybody knows the exact percent, it's probably dynamic anyway), just like with extending players' contracts - they will always ask "a one time fee" and that fee is always 10% of their value.
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