Insanely light sentence

The Herald reports:

Rotorua woman Santana Tonihi’s criminal record stretches 13 pages, with most of the 129 convictions being for stealing from shops. …

Judge Skellern gave a starting point on the burglary of the television charge of eight months’ jail and added another four months for all other charges. 

She then discounted the 12-month prison sentence by 25% for Tonihi’s guilty pleas but added another two months for her previous convictions and a further month for offending while on intensive supervision.

That gave an end sentence of 12 months’ imprisonment, but given she had already served about five months in custody, it meant she only had one month left.

A mere two month uplift for 129 previous convictions. That is ridiculously light. It is meaningless.

How about this. Say you get one month extra in prison for each previous conviction?