You were so close...at least as I understand your requirements.
Select COUNT(*) / LEN(x.Vals) TCRuns, x.Vals
FROM
(
SELECT t1.ID as RunID, msv1.Val as Vals
From trial t1
CROSS APPLY
(SELECT
(SELECT t2.Val --+ '|'
FROM trial t2
WHERE t1.ID = t2.ID
ORDER BY t2.Val
FOR XML PATH(''), TYPE).value('.', 'varchar(max)')
) msv1 (Val)
) x
Group by x.Vals
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Understanding and Using APPLY (Part 1) - http://www.sqlservercentral.com/articles/APPLY/69953/
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