Checking System Center Virtual Machine Manager (SCVMM) User Role before creating would be better. Nobody wants to get errors when deploying virtual machines.  Checking SCVMM user role is so simple:

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$UserRole = "blabla"
$checkvmmuser = Get-VMMUserRole $UserRole
if ($checkvmmuser.Profile -eq "SelfServiceUser")
{
Write-Host "That User Role already exist."
}
else
{
.\createvmmuser.ps1 "FirstName" "LastName" "SamID"
}

I don’t know any other way to check SCVMM User Role. But this is the best so far.