I understand quitting if you were stuck on a cancerous team with shit leadership, but the Sharks won SPL LAST YEAR. It's not like the Sharks did a terrible job of drafting either, they just had some guys who had off years. Also, as a newer SPL player you have an opportunity to make a statement for next year's draft by performing at a high level now. Quitting by no means increases your stock for SPL 7, and it isn't rare for players who were picked up one midseason to go undrafted the following year (Kebabe being a prime example). Nothing is official yet so I'd give some thought what you're doing to your teammates and managers.
I'll never understand the mentality of some players :[