OK, and what you personally suggest in case with Becker, for example? Should we count his numerous attempts as almost-titles and put him higher due to this?
Actually I understand what you meant very well. But it can`t work here. Because in the end of the day such very doubtful list turns into... hell, even don`t know what to say exactly.
The same Boris was close plenty of times, but he failed in all of them for a reason too. You can always look at these situations from different angles. You are very near to position "few close attempts" = "deserved to count". It is list of best of the best, attempts should be counted in 10th turn after more important criterias, IMO, and then you realise they don`t change much.
There is another list on here which assigns numerical values to various milestones (GS wins, finals, SF, etc..) but it's only since 1990 I believe. I quite like it - would be interesting to see it extended further back.