My friend was an extra on Queer As Folk not too long ago....I think it paid about $10/hr. However, he said there was a lot of time waiting around on the set that he did not get paid for. A three hour shoot ended up consuming 6+ hours of his time.
Extras are a dime a dozen in Toronto - for the most part, they don't pay very well and aren't all that glamorous. But it depends on your part and what show it is.