Why limit yourself to the exchanges in Singapore only? The world isn't as small as you think, you'd prefer to stay in the exchange where volume per pair is overwhelming. Its going to be a lot easy to trade and liquidate once again to store your BTc on hard wallet at the end of the day. 

There are Chinese exchange though such as yunbi as far as i know, Singapore still is partly China.

well

in indonesia just a few people make profit from mining.

because

government fee

include import taxes and many other

if you want mining in indonesia

you must have muchhhhhhhhhhhhh permission from the government

and place and much more

so the point is

mining in indonesia is not simple

Ripple must be getting serious as Bitstamp added them as their first altcoin.

Believe me I have nothing enlightening for you, although I wish I did.  I was just starting with the Stellar question since a lot of people signed up for it when it came out.
One of the creators of ripple left and started Stellar, they are very alike.

Yes it can. Let's pretend I purchase an Avalon 741 for $818. Assuming it isn't a defect (which it shouldn't be, since Canaan has good quality control compared to BitMain), and that the difficulty doesn't change, I can mine ~140$ USD at today's exchange rates every month. Let's say my electricity costs 70$, so I made 70$ profit in a month. 70*12=840$. I'll subtract 240$ to compensate for difficulty increases, and end up with 600$ USD. Now, I can go to ebay or amazon on BCT and sell my Avalon for at least 500$, probably. Now I have 1100$, which is 34% APR. If I try to sell it for higher (probably 600$+), I could make a 40% APR.

I totally agree, but I wanted to see if he knew what Stellar was.

But how about this.  If XRP ever goes up in price, I will guarantee XLM gets pumped right along side of it with no new news from the Stellar camp.

Also lending to a miners should give you a daily return. If this doesn't happen, i suggest to ask him to repay his debts daily.

gambling always have risk, in the long run, the house edge will win over the players, this is maths, so the best way is to quit gambling 

How much do you plan on investing, and how trustworthy is the owner of the farm? Considering you are willing to fly over and see, this must be a large amount, correct? Also, what if the difficulty rises a bit so he doesn't make much of a profit, but still a profit? That would be a losing situation for him.

Also noticed that he would be paying "interest" to you, as you didn't state you would get your principal back, so I would encourage you to definitely avoid it. Miners staying profitable after 2 years would be quite a large gamble.

Avoid. This screams scam (to me anyway), as it's pretty suspicious. Are you sure he actually showed you his farm, and not just video footage of another farm or racks of random computers/really old miners? 40% APR is hard to reach with mining, and the fact that he offered an almost fixed rate makes it even more suspicious. The difficulty jumped 16% yesterday, and is expect to jump another 10%+ next change, so his earnings (assuming they are real) will go down. If you must invest in mining, I'd recommend Hashnet