its better to if we invest in mining site or gambling
You can invest in "mining" site but it seems that such sites are closed sometimes and users lose their money.
You cannot be sure if mining site is not a hyip.
you are asking 0.0005 btc for level one and
0.0005 btc = 0.16 $ usd
and giving ( $0.03 monthly ) that means
it takes 6 months to take our return back
Here is a topic about
http://ore-mine.com/lands game, not about main site.
In the lands game you can instantly win up to 10 BTC.