Very nice sale, though it is a top search term for casinos.
Not to be picky, but I think the domain without the 's' would be better - unless you're making a directory site. Just checked Google keywords and 'online casino' does score way higher than 'online casinos'.
In any case, it is good for .ca space to have that kind of sales. It is hard to explain why people will pay that kind of money for it, but
this is a beauty of it. If I don't understand it, that doesn't necessarily mean that it doesn't make sense. Sales like that help the market
to form, and seed more awareness.