Hi I will invest to any idea about earn bitcoin. I would start from 0.1 BTC. If everything will be ok I pay more more money

I wait for PW

why you will start with 0.1 btc .i will suggest you if you want invest btc at any site then invest not more than 0.001btc . because in the presence time no one site is honest . every site ran away within month .
lots of sites have higher minimum investment than 0.001btc. so it is not possible to invest 0.001btc anywhere. but I understood what you exactly want to say.. and I agree with you..
Yes. start investment from as less amount as you can. because if the site ran away with your money your loosing amount will be lower.. you can increase investment after confirming and proving everything.
But what can you do with 0.001BTC or anyone for that matter and even if you could do something with it, how much could you get out of it? Almost nothing I suppose