[Election-Methods] Range Voting won't eliminate spoilers

[Greg @ Somerville for IRV]

I don't believe that Range Voting will eliminate even the kind of
spoilers that IRV does away with. Consider two-candidate race between
Bush and Gore in which 51 voters prefer Gore to Bush and 49 prefer
Bush to Gore. Following the directions given on the RangeVoting.org
website, voters should give a '10' to their favorite candidate and a
'0' to their least favorite:

  51 people rate Gore=10, Bush=0
  49 people rate Bush=10, Gore=0
  the result: Gore=510 > Bush=490 (Gore wins)

Now we re-run the election with Nader in the race. When Nader enters,
5 people for whom Gore was their first choice switch to preferring
Nader. Those 5 voters rate Nader a '10' and push Gore down to '5':

  46 people rate Gore=10, Bush=0, Nader=0
  49 people rate Bush=10, Gore=0, Nader=0
  5 people rate Nader=10, Gore=5, Bush=0
  result: Bush=490 > Gore=485 > Nader=50 (Bush wins)

How could the 5 Nader voters suddenly have a different utility for
Gore? In reality, the rating a voter will give to a candidate isn't
some fixed objective measurement of their happiness with a candidate,
but a rating relative to the options available. In short, everyone
will naturally grades on a curve. To say that RV satisfies IIA is to
ignore the reality that ratings will inevitably be relative.

Thus, Nader would still be labeled a spoiler, because his entrance
into a race causes some to rate Gore lower.

Agree?

Greg