I can tell you one thing from experience, only about 30% of .in/.co.in sales are actually even reported.
A lot of companies want to keep what they paid quiet, though for most its a pittance.
I really have no experience or indication of .ca, though Canada is a first world country so I wouldn't like to comment on comparisons, but .in is extremely viable. .co.in has been around longer but it has a downside -
While .in = India/Internet/International/Interactive/In....
.co.in = Indian company - kind of limiting.
When we started publishing in the Indian market in 1998, the entire userbase was 500k, now its closer to 70million, spending is way up, sites like naukri(jobs), shaadi(matrimonials), rediff(portal) are stand alones that are already worth $1 billion+. Ironically, all are .com, however the new breed - oneindia, zoom, aol (all .in) are really taking on the top guys.
The whole advantage for this ccTLD is that development is already huge and its penetrating real fast, .net.in/.org.in are also being used by smaller companies who can't afford or don't want to shell out big money to domainers. As we all know, development is what really drives up prices for extensions, not domainers
And a large part of this development is by German, American and Russian domainers (.in) too!