No, I meant that they have a better performance than their rating would indicate.
People who have played over 1000's of games are lower rated?

Practise doesn't make perfect. PERFECT practice makes perfect. now if only i could work out how to do it :-(

Of course that is the case. Take the following scenario of playeres who have been on the site multiple years:
You decide you want to take up chess, but you aren't very good. So you join a chess site. You lose a lot of games. (Your RD is high so these games count a lot).
As you slowly improve, you win more games, some against higher rated players. (Your rating slowly increases, but takes a while to reach your level)
Finally, you've played 10000s of games and you reach your peak performance, but because win you were worse your games counted more you are underrated. It seems like this would be expected.

Improving is more than about playing. If you are unaware of your mistakes you cannot improve and if you don't work on improving your weaknesses you won't get much better either.

Of course that is the case. Take the following scenario of playeres who have been on the site multiple years:
You decide you want to take up chess, but you aren't very good. So you join a chess site. You lose a lot of games. (Your RD is high so these games count a lot).
As you slowly improve, you win more games, some against higher rated players. (Your rating slowly increases, but takes a while to reach your level)
Finally, you've played 10000s of games and you reach your peak performance, but because win you were worse your games counted more you are underrated. It seems like this would be expected.
It doesn't work that way. Let's look at just the last 100 games. In these games your RD is at the minimum so you win or lose about 8 rating points per game if your opponent is rated the same as you. So in these last 100 games your rating has the potential to swing up or down by 800 points, wiping out your original rating (if your playing strength is different from it).
Due to high RD the first few games do matter a lot, at first... but if you play a bunch of games, the first few games you played fade in relevance as your true strength shows.
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This is what I have found, I'm not sure why.