There are many, many more season tickets for sale at the higher price point than those at at the cheap end of the scale. Paying £700 doesn't get you the best seats in the house and the gradual rise has been a joke.
It's great that the club are making some available at a cracking price but it's not nearly enough.
I don't think anybody expects to be paid to go, instead the club are happy to rely on years of loyalty and new fans who couldn't give a fuck what they pay because they're not really part of the club, just tourists enjoying a day out.