If you are in serious financial difficulty, and you wife just plain doesn't like motorcycles, getting rid of it might be the right thing to do. But. If you are a long time "committed" rider, and owned a motorcycle when you got married, and are not losing the house, I would keep it. If riding is a serious part of your life, you simply just give it up. But OTOH, if so, did she know that? Things are not always as simple as they seem.
I got married 22 years ago, to someone who knew riding was an important part of my life, and knew that I would not be giving up my motorcycle. All seemed well, until a few months later, when she brought up getting rid of the motorcycle again. I refused to even discuss it. We had discussed it BEFORE getting married. She knew the deal. Then we had two daughters, and she started up on it again. Used every dirty trick in the book, even to the point of saying, "what happens if you get killed in a motorcycle accident and the kids have no father". I was even in the doghouse for 2 days for buying a motorcycle magazine Less than 2 years later we were divorced. Yes, there were other things involved other than a motorcycle, quite a few incompatibility issues.
Shortly after the divorce is when I bought my first Vulcan 750, a '93. I also bought a dirt bike. And as soon as the kids were old enough, I bought them dirt bikes too, and started teaching them to ride, and they loved it. Their mother didn't, and of course got very upset, but since they loved it so much, she didn't forbid it (she had custody, as is customary in my state) They both became accomplished dirt riders, and one got her endorsement at 18, after taking the MSF course. I got her a Rebel 250, in the hopes we would be able to ride together, but it didn't last very long, she wound up getting married, and the younger one so far hasn''t shown an interest in street riding, and I have not pushed her, because I know how dangerous it is if you don't take it VERY seriously. So I still have the Rebel, which sits around a lot, along with several other bikes. I just sold the Ninja 500 yesterday, because I could no longer ride it without severe pain, and knew it wasn't going to get any better.
This is just my opinion, having failed at marriage myself I am no expert, but I don't feel that anyone has a right to give their husband or wife an ultimatum about anything reasonable, and there is nothing unreasonable about owning a motorcycle. I fully understand the value of a "good" marriage, but any marriage is supposed to be a partnership, with compromises, and very few absolutes. You may already have problems that getting rid of a motorcycle won't solve, at least more than temporarily. I would be, and was, very resentful at her demands that I give up my motorcycle, and that resentment would have remained even if I had gotten rid of it.
I won't go any farther, it sounds like you have already decided to give it up, and that is your choice. I have no way of knowing what the situation is, but I do advise thinking about it and talking to her about it some more if you really want to keep it. If not, then list it on Craigslist at high bluebook value, so you have wiggle room, relist it every few days, and drop the price occasionally. The longer it takes to sell, the longer you have to ride it, unless she has forbidden that too, in which case I know what I would do.
I am a motorcyclist, NOT a biker.
1997 Vulcan 750, purchased about a week ago
2006 Sportster 1200 Low
2013 Royal Enfield Bullet 500, converted to carb
2001 Yamaha XT225, heavily modified
2004 Honda Rebel 250
1979 Vespa P200E
2002 Vulcan 750 parts bike
1994 Yamaha XT225 parts bike