>>I am left thinking the whole thing is for financial gain.
You wouldn't be the first to think of that although it is fair to say that marriages entered into with that in mind usually come to an end just as soon as the foreign spouse has received permanent leave to remain.
It is impossible to know what the outcome will be without knowing the figures. This is not a short marriage. Therefore there is no question of your wife being left with nothing. The fact that your assets were built up before you met will count for something but as against that a court would have to work out what reasonable needs you each have.