Except that the jury has no role in sentencing. That is entirely down to the judge. And no, it isn't lawyer speak for being able to buy your way out of trouble.
Previous good character is considered as mitigation when sentencing, but its impact depends on the severity of the crime. To show previous good character, the offender needs to show that they have no previous convictions at all and that they had lived a productive life (so, for example, someone who has spent years living on benefits and abusing drugs would not qualify). Things like longstanding charity work or voluntary work help but are not essential to establishing previous good character. Most posters on here would be considered as having previous good character.
Where someone has used their previous good character to facilitate the offence, their good character would not be regarded as a mitigating factor and could be an aggravating factor, leading to a higher sentence.
Previous good character can reduce the sentence. However, no matter how good the offender's previous character, it can never justify stepping outside the sentencing guidelines.