Maybe with 50.000 euro on ads for 1 country you might see that on the first page, not certanly on the first result.
50k is a bit exxagerated
an ad listed top of google when you type in "metin2" or "metin2 pserver" isn't that expensive
for 16€/day ( 500€/month ) you can get around 40 clicks on the Homepage daily in Germany for example
I think it's more of a problem that 40 clicks/day doesn't pay off for such a price
edit: Forgot the vote4coins part - I'm strongly against it as well
In my opinion daily reward is a way better system to get players stick to the game because exactly of what Elspeth mentioned above - most sites are rigged anyway
and if I remember correctly even if they pay the site to get rank 1 it doesn't pay off