Never noticed it before, but having scanned an entire magazine, I can't believe how many pages in British magazines are advertising!
... over 60%
The rule in the mags I work for is 60%+ editorial and the rest adverts, but it varies in different industries.
While I appreciate that many people think publishing a magazine on model boating is a licence to print money, in reality, it's a long way from that. Were the Canadians working in a bigger budget industry, selling plans in breach of copyright might attract lawyers, as it is, I doubt MTM can afford to chase them in international court cases. Even if they did, would the court award anything that would cover their legal costs? Is it right that someone can break the law and get away with it? That's for you to decide.
Coming back to the adverts, those are what keep any hobby magazine viable. Some of us even enjoy looking at them and buy stuff from advertisers. If you do, tell the advertiser, so they know there is value in their advertising.