Perez gets preferential treatment because the powers that be at BBHQ says so.
Strongarmed by the bosses at Channel 5 who need a few extra bob in their piggy bank to fund timeless British classics such as 'Can't Pay? We'll Take It Away!', 'Benefits Britain: Life On The Dole', 'On Benefits & Proud', 'My Big Benefits Family', 'Can't Work, Won't Work', 'Depending on the Dole' and 'Benefits: 19 Kids & Counting the Cost'.
Perez is Channel 5's meal ticket, and there is no way on planet Earth they won't manipulate the rules of the show to make a profit. There is categorically no way that Channel 5 would risk a ratings plummet and I can't blame them. It's all about ad fees.
How else could we continue to enjoy's Britain's #1 Fountain of Vitriol-Inducing Spiteful and Hateful Cash-Ins of Benefits Bashing Programming.