Surely that statement is either totally incorrect or very naive. All business costs are factored in to the price of goods. Advertising is a recognised business expense for tax purposes, I'm sure certification fees are as well. You may as well say salaries don't get added to the price of goods.
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No most production businesses have little control over their selling price, the market decides that, So they are not free to just keep raising prices as they see fit. but when it comes to marketing, which certification is part of, it generally works as follows.
a company establishes how much the market will be willing to pay for a product, then they work out how much it would cost to produce the unit, if the market will pay $1.50 and they can produce it for $1.00, they will put the product into production, because they can make a 33% margin.
Obviously though now that it's in production, they know the more units they sell, the more opportunities to make their 33% margin and if they can increase scale they can reduce production cost to maybe $0.95 increasing the profit margin to 37%. So they are willing to reinvest a portion of profits into their marketing budget, to grow sales.
The marketing budget will be spent on all sorts of things to promote the product, whether than be in store samples, TV, Radio, Newspaper ads, paying someone to organise and manage a facebook page or other social media, sports sponsorship, news letters, prize competitions and many more including certification.
So answer me this, what did Muslim people eat before Halal foods came on to the market in Australia ? Did they import all their foods from overseas, or did they eat the horrible heathen stuff ?
Their local halal butcher and halal deli probably had the meat market cornered, certification is a way for other companies to bust into that market.
and yes, a lot of trusted brands would be imported and sold in Muslim owned stores, if you have been to western Sydney you know what I mean, certification lets Aussie companies compete with these trusted brands.
and for every thing else they would have just taken a lot of time researching ingredents I guess or avoid products that they weren't sure about, certification lets the companies that met standards to be an easy choice, eg more sales.
If they did eat non-Halal foods, even a morsel, are they condemned now to a horrible fate in Hell ? Can any Muslim in Australia guarantee that they have never eaten "unholy" food ? If they can't, then they are all doomed by the Koran to suffer the consequences.
You would have to ask a muslim what they believe,