Sub accounts? Emphatically against.
When I crack the top 1000 or top 100 (I'll never be a WR holder), it's really rewarding. Rewarding to know that there are less than 100 (or whatever number) players who are still better than I am.
With sub accounts, I have no idea how many are fakes. Sub accounts prevent rising newbs from seeing the true extent of their progress.
NO to sub-accounts.