Financial domination can seem odd to people who are not familiar with the fetish. This type of the fetish generally appeals to men who earn large sums of money. The man that craves this is the one who feels that his power as a person comes from his ability to maintain a level of income that is far above the women in his life. He wants to be submissive for the same core reasons that any man feels the want to be submissive. These reasons can be anything from the need for a release of stress to want of feeling broken down. When a dominant woman comes into his life he may find himself not able to reach the level of submission unless money is involved. Remember his sense of control comes from money so his desire for loss of control also needs to come from money.
There are some men that just enjoy a woman sweetly and seductively draining his wallet of every dollar. He is completely aware of what is happening to him. He enjoys watching her take more and more control over the money that he works so very hard for. When it comes to playing online there can be a number of ways of doing this. Online shopping can invoke the same feelings as being drug around all day while a woman burns through his funds on the things that she wants. He is only there for the money he can provide. His boredom is part of her appeal she wants him to be uncomfortable. Another way that is commonly used with online play is demanding a man just to give her money he knows he will have no control on how she spends it. He knows that she could use it on someone else. This type of play appeals to men that are drawn to the thought of being dismiss-able or even to some of the cuckold crowd.
Drain the wallet and financial domination is all about having someone take over control over something that society tells us to protect. The appeal of this is being unsettled beyond just the moment of play.