wah, ETH 250$

I found a way to earn 4% to 5% if you have account in Gemini and CEX.IO.
You can buy cheap at Gemini then transfer the coins to CEX.IO to sell at premium.

Lets take 1 ETH as an example.
Currently Gemini buying price USD $351 while CEX.IO selling price is USD $380.
The difference between buy and sell is usd 29. After minus forex loses, transactions fees and using DBS 0% remit, you can earn about usd 14 (4% of your $351 investment)

If you use is on multiplier of 10 ETH, your profit will be $140 for $3510 investment.
When you buy at Gemini, instantly transfer to CEX.IO to sell. The time between buying and selling is about 14 minutes apart including transfer time between 2 exchanges. It reduce the risk for the coin price fluctuation and you earned minimum 4%.
It can be done to bitcoins also. Both ETH and bitcoins can achieve 4% earning between both exchanges. 

Do this trigger any suspicion or alarm bell on my bank account because of incoming and outgoing fund flowing through my account once per day? I scared my bank account will aroused suspicion on money laundering or illegal activities.

Anyone with same experience before?

Updated with Bifinex as an example.

It is possible to earn 8% if you have account in Bifinex  and CEX.IO.

Lets take 1 ETH as an example. (in USD)
Bifinex buying $336
CEX.IO selling $376
Profit $40 (12% of your $336)

Minus
if using DBS 0% Remittance fees - 0% (depend on your bank remittance rate to wire transfer to Bifinex USA account)
Forex losses - 1.5%
BTC/ETH transmission fees from Bifinex to CEX.IO - 0.5%
Buying and selling fees at both exchanges 1%
CEX.IO Visa and Mastercard Withdrawal fees to your bank account 1.2% +usd $3.80

Net Profit 7.8% ($26)

The $3.80 is negligible if your investment is big amount.

If you use is on multiplier of 10 ETH, your profit will be $256.20 ($260-$3.80) for $3360 investment. 

I am in the midst of applying for Bifinex account since it is cheaper than Gemini.

oh btw, buy from GEMINI n sell back to SG Coinhako probably can earn as well 

Yes, instant. I tried that before with 1.2% + $3.80

Where did you bought yours? got mine during black friday from the official site.. delivered from Hong kong.. and received in one week..