About the referrals - yes there is referral link on the site, but come on - posting in this forum you have yobit accounts already. And this script costs but I give it to you for free 
About the detection you are right - it only filters the table in the browser which is absolutely undetectable
The script costs how much? If that's much more than what you can get from the free coins of YoBit then no one's buying that. Of course you'll give that for free to have referrals. I wouldn't risk my PC getting infected by virus or some malwares from your program/script just for a little amount of satoshis. What exactly is your reason OP for being a 'good guy' here and giving us that?About the detection you are right - it only filters the table in the browser which is absolutely undetectable