How much to not give a penalty?

My comment about Clattenburg having an advert for Air Asia on his sleeve has got me thinking. Tell me, when would an advert on a referee's shirt get maximum exposure? Perhaps when the referee grabs the headlines by making an appalling decision? That Air Asia ad on Clattenburg's sleeve featured in countless newspapers and all over the web. Should the FA / Premier League allow this? What guarantee do we have as supporters that the sponsors are not buying exposure by bunging referees to get things controversially wrong? Perhaps somebody really should check who exactly Mr Clattenburg is flying with if he is jetting off on holiday!