Maybe it's just an assumption, but I think that if you target an offer that is only for the UK it's getting better conversions then when the offer is also for US/CA etc.
When someone refers me to a website where I see many language options (for example in the right upper corner with flags etc.) I somehow get the feeling this is not the offer I want to sign up too.
That being said, almost all adult UK offers are also available in US/CA etc.
And when I look at the available offers from ClickDealer, Adsimilis, Advidi etc. they are all having the same junk.
How do you find your offers to test? Do you use Offervault or just the spy tool to see what everybody else is running?
Thanks,
Dennis

In "theory" it would work, but in actual practice offers don't always work that way. I've learned not to think too much about the offers. I just run it and let the numbers talk.
The UK offer might be more locally targeted, but there's a lot going on in the backend that affects conversions. The un-targeted US / CA offer could convert better overall.
Keep in mind you have an impact ton how well the offer converts. The offer could be "junk" for you, but others could make it work due to more targeted ads, landing pages, and placements.
As for finding offers: revenue sheets from affiliate networks, spying, go to conferences and form relationships, cold-email direct advertisers, etc.
When promoting a product in a certain country, optimizing your ads/landing pages for local lingo helps a HUGE amount. Example: I am from the UK, people say the word "Shag" or "Pump" a lot when referencing getting laid or fucking, in the USA "Fuck" "Fucking" "Bang" "Banging" are all more common ways of saying getting laid or even the words "Get laid" themselves. When you go to non English speaking countries, marketers tend to just get banners made or use google translate, the lingo is not even close. Another example: One of my team is Dutch, when he see's ads come in for NL he laughs because the translations are pretty bad, it isn't stuff Dutch people would say when thinking about getting laid.
Small things like that can really impact a campaign, we test it on our end with identical banners but real local lingo vs translated English statements, the results are surprising.