/dev/null changes result, why? ( How to know if svn repository exists )

Hi,
Because I am writing last few weeks some scripts for a project, I do want to put those under svn ( subversion ). As a scripting exercise I want to be able to create Repos and project folders in one go and add changes to the repo's svn conf files.
I want to check if there is already an existing repository and if the name=passw line is already added to the passw db.
I did use:
svnlook youngest /Volumes/Development/_svnRepo/SSHToolNew 2>&1 | grep "No such file or directory" -c
to check for the error message returned by svnlook
svnlook: Can't open file '/Volumes/Development/_svnRepo/SSHToolNew/format': No such file or directory
and want to continue doing my stuff when the result is bigger then 0, otherwise create the repo first with some options.
With the following info
/Volumes/Development/_svnRepo/SSHTools exists
/Volumes/Development/_svnRepo/SSHToolNew doesn't exists
using ( typed in the sh )
svnlook youngest /Volumes/Development/_svnRepo/SSHToolNew 2>&1 | grep "No such file or directory" -c
1
echo "rv:" $?
1
gives as result 1 in the shell and when using echo "rv:" $?
however
svnlook youngest /Volumes/Development/_svnRepo/SSHToolNew 2>&1 | grep "No such file or directory" -c &> /dev/null
echo "rv:" $?
0
gives 0 as result.
And when the folder do exists it return the opposite!?
Just to understands the happening. Why the difference with &> /dev/null ?
What do I mis here?

Hi Thanks you for your reply,
I want that the result goes into a var so that I can compare it in an 'if' statement.
If I leave & out then I get the following same result
bash-3.2$ svnlook youngest /Volumes/Development/_svnRepo/SSHToolNew 2>&1 | grep "No such file or directory" -c > /dev/null
bash-3.2$ echo "rv: "$?
rv: 0
It should be one ( 1 ) because the result count is one. Or am I wrong?
So basicly, why is it changing the result? or is $? not the result of my line?
What is the best way to check if f.e a command is failed like the one I use in an if statement? Can I move the result directly into a var, something like?
bash-3.2$ svnlook youngest /Volumes/Development/_svnRepo/SSHToolNew 2>&1 | grep "No such file or directory" -c | MyVar=$? ( or whatever needed )
Thanks again

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