The reasons why vary from sentimental to hope the player will either regain his form or return from injury.
Goalkeeper:
Cech, Chelsea, 6.7 million, 31 points owned by 11.1% of managers
Defenders:
Vidic, Manchester United, 7 million, 7 points, owned by 12.5% of managers
Luiz, Chelsea, 8 million, 7 points, owned by 5.7% of managers
Rafael, Manchester United, 6.7 million, 0 points, owned by 4.1% of managers
Midfielders:
Gerrard, Liverpool, 7.2 million, 14 points, owned by 8.5% of managers
Kuyt, Liverpool, 7.1 million, 22 points, owned by 6.9% of managers
Wilshere, Arsenal, 6.5 million, 0 points, owned by 5.1% of managers
Rodriguez, Liverpool, 5.8 million, 1 point, owned by 3.1% of managers
Essien, Chelsea, 6.5 million, 0 points, owned by 2.5% of managers
Forwards:
Hernandez, Manchester United, 7.3 million, 39 points, owned by 11% of managers
Berbatov, Manchester United, 7.2 million, 7 points, owned by 7.2% of managers
Tevez, Manchester City, 7.5 million, 2 points, owned by 6% of managers
Notes: Van Persie is the top-scoring striker with 79 points. He has a 10 million value and is owned by 19.5% of managers. The high salary likely explains the still low percentage of ownership; however, it also could be that managers know the Dutchie has a long history of extended injury breakdowns.
The players with the highest percentage of ownership at each position:
Goalkeeper: Hart, Manchester City, 19.9%, 50 points, 8.5 million
Defender: Baines, Everton, 22.2%, 34 points, 7.2 million
Midfielder: Silva, Manchester City, 49.6%, 77 points, 7.8 million
Forward: Rooney, Manchester United, 53.2%, 67 points, 8.6 million
Note: Rooney has been playing in midfield, but still only gets Forward points