I had a similar thought; if being ranked on 2 of 63 ballots is enough to get 11th place, then in some years, 9th and 10th aren't going to be much better, if at all.
Have you found any particular years that are problematic at the lower end of the top 10?
No, i haven't/hadn't. it had been a really long time since I looked at a list, too. I just dragged this one up right now -
SELKE 1999/2000
1. Steve Yzerman 431 (32-11-5-2-3)
2. Michal Handzus 188 (6-10-10-2-2)
3. Mike Ricci 125 (3-6-5-9-1)
4. Adam Oates 112 (4-5-3-6-4)
5. Michael Peca 66 (1-5-2-3-2)
6. Pavol Demitra 57 (2-2-4-1-0)
7. Mike Keane 57 (1-3-3-3-2)
8. Todd Marchant 53 (2-3-2-0-2)
9. Guy Carbonneau 39 (2-0-2-2-3)
10. Joe Sakic 37 (1-3-0-2-0)
11. Bobby Holik 29 (0-3-0-2-2)
12. Ron Francis 28 (1-0-2-1-5)
13. John Madden 23 (0-0-1-5-3)
14. Steve Rucchin 20 (0-0-2-2-4)
15. Jere Lehtinen 18 (1-1-0-0-1)
16. Craig Conroy 17 (0-0-2-2-1)
17. Jamie Langenbrunner 14 (0-2-0-0-0)
18. Daymond Langkow 13 (0-0-2-0-3)
19. Mike Modano 13 (0-0-2-0-3)
20. Claude Lapointe 11 (0-0-2-0-1)
21. Pierre Turgeon 10 (1-0-0-0-0)
22. Bates Battaglia 10 (0-1-0-1-0)
23. Mark Recchi 8 (0-1-0-0-1)
24. Benoit Brunet 8 (0-0-1-1-0)
Shaun Van Allen 8 (0-0-1-1-0)
26. Yanic Perreault 8 (0-0-0-2-2)
Stephane Yelle 8 (0-0-0-2-2)
28. Peter Forsberg 7 (0-1-0-0-0)
29. Petr Sykora 7 (0-0-1-0-2)
30. Radek Bonk 6 (0-0-1-0-1)
Additional 16 players received votes for Selke
I suppose that anyone on here with more than a few votes (pretty much those in the Top 10) deserves to be noted as a defensive forward. I kind of feel that if you aren't getting a ton of votes, maybe more than 10, that there is a ton of leeway for homer votes. Whether I'm right or wrong about that, I feel confident that the guys from 6-10 on this list earned much less respect than the first 5. Without pulling up the top 20 scorers that year, I will assume that there may be as little as 10 points separating 5th from 10th. This is a typical year, from what I've seen, and I think that to cut both lists at Top 10, unbalances things a bit.
To illustrate - many people are talking Toews for the Hart this year. Datsyuk hasn't been mentioned, and likely Toews will get the Selke to make up for probably not getting the Hart. Datsyuk got 3 points in Game 48 and made 10th place in points. Toews is a point back. Datsyuk will make this list Toews will not. Now, I'd like to say that I think Datsyuk has been under-appreciated this year, and that I don't think there is much separating him from Toews - BUT, the difference between 10th and 13th in this years scoring is splitting some serious hairs, and if there were 49 games, there might be a complete shuffle in that area of the list. I think that Pav is just as good as Toews defensively, but many don't - so let's pretend that he was simply a responsible two-way guy, like Parise or Kopitar. He'd still get on this list, likely, as those guys will probably receive enough votes to breach the 10 barrier.
I think i'm rambling - anyways, the top 5 in votes, in my mind, is as impressive as making the top 10 in scoring.