Sri. Murari, Greetings.
I think, there may be an answer for you. I was thinking about your question; at 3 in the morning, I think, I had the answer. I am typing this in the early hours of the morning.
I think your answer is in Mahabharata. In fact I wrote the answer first and then I asked the question!
Lets's take your role description. In the business world, you represent your clients. I am sure your clients would be involved in legally accepted activities, only face the cut throat competition and the generally corrupted officials. You are also responsible for the welfare of your family, relatives and your close community. In a way they all are your clients too.
Your dharma is to work for your clients. If it takes few short cuts to achieve the benefits for your clients, so be it. You should just go ahead and do it. As long as you are not attached to it, you will still stay in Karma Yoga. You should refrain from owning any fruits from those actions and any blames from those actions. You should refrain from indulging in any pleasures from that kind of money. Let me explain - I enjoy my drinking sessions during my breaks; Sunday night was one of those. I have no regret for that. In fact, most members here knows when I am downing my drinks; I almost sit out in the open in this forum and drink in front of everyone! But I don't even consider that as a vice! Complicated to get? Well, 'not to have attachment' is like that. Slightly complicated; but you have to listen to your consciense to guide you, to set your own rules accordingly.
Kindly listen to this song. I know you would have listened to it 100s of times before, once more wouldn't hurt.
Karnan Lord Krishna explains his actions.flv - YouTube
புண்ணியம் இது என்று உலகம் சொன்னால் அந்த புண்ணியம் கண்ணனுக்கே!
போற்றுவார் போற்றலும், தூற்றுவார் தூற்றலும் போகட்டும் கண்ணனுக்கே!
கண்ணனே காட்டினான்! கண்ணனே தாக்கினான்! கண்ணனே கொலை செய்கின்றான்!
( Punniyam idhu endru ulagam sonnaal, andha punniyam kannanukke!
Potruvaaar potralum, thootrvaar thootralum pogattum kannanukke!
Kannane kaattinaan! Kannane thaakkinaan! Kannane kolai seigindraan!)
That is part of detachment. Don't count the money you get in that way. Don't try to amass wealth in that way. Just earn enough to support your family, educate your children etc.
Importantly, when your family responsibilities are met, get out of the adharmic situation as soon as possible and take up a simple job to support you and your wife in a simple life. Seek counsel from elders, please.
Inportantly, pray and seek guidance from God... Whatever form you pray to God.
Disclaimer - I don't believe in God. But that doesn't mean God doesn't believe in me, if there is a God. Although my message sound a bit authoritative, it is not. I just typed out whatever came to my mind. I only mean respect to everyone.
Cheers!