Others will have thier opinion of this but here is mine...yes your strike rate is a bit low but you could still make money....how much depends on what you are willing to start with
Example
10.000
betting 3% a selection 10 selections a week
at your quoted amounts bet $300x6@$2 = $3600
profit= $600 50% of this goes back in the bank thats $300
stay at the 3% of 10.000 for the ten weeks then readjust your amount example of above would be $13.000 betting $390 thats a 33% increase in stakes resulting in an increase of profits 10 selection @$390 a selectionX 6 @$2 equals return $4680-$3900=$780 50% back in the bank leaves you $390....i know this is not exactly a weekly wage but if you could do this on a regular basis and increase your bank by 30% every ten weeks statring with that $10.000 by the end of the first year your bank is at $37.129 and you are earning $1100.00 a week and adding another $1100.00 to the bank.

Now we all know things don't run as smooth as that but it does show you how small fish can lead to a bigger feed