I agree with you MTE... the ASX also does have 'expensive' stocks like RIO, NAB, CBA, BHP etc. > $30 and you get get $0.50 to $1.00 spreads on them.
I think if you do theoretical options price of spreads its better returns to do 5 x $0.50 spread than 1 x $2.50 given the same, volatility, share...