As some people suggest that you should try to attract more people from USA or Uk to get more click value in the adsense income. Is it true?
Attracting people from richer countries sure is a better bet. US + UK is a good choice for an english web site, but other language are also fine (french, german, spanish) if you target Europe.
US and UK usually pay about the same. Canada is a lot less. Most other countries are a lot less, too (at least in terms of CPM payments).
I don't discriminate I go world wide.... Traffic from other countries + US & UK is way better than 0 + US & UK that u are targeting. And they pay well too don't believe the hype.
It is ok to target UK or US user because that will bring you higher income! But, I think you shouldn't neglect the user from other country.
I've been focusing on UK-targetting sites but want to branch out into other zones as my adsense earnings slow down to a tiny trickle overnight, when my audience is sleeping!
Absolutely U.S. Also you can anaylse this if you use adwords. You need to make the highest payment per click to make your ads visible at U.S. Also you can generate China traffic in 10 minutes with 1 cent payment per click.
Naturally, hit UK/USA audiences if you can, but also target some other countries in completely different time zones, sure they may not pay as good but if it tops up your earnings it still makes sense. Remember theres always untapped niches, look beyond the obvious. Plenty of europe is quite well off, not just the UK, and plenty of other countries use english a lot.