Is it wrong to earn money from a passion project?

I've been thinking about my career and what I want to do in the future. Working on Sudo Haiku has been so far a very rewarding experience, and it feels amazing to create a thing that people enjoy using. I spent a really long time within on it, having started work two years ago and working on it intermittently ever since. 

There's been some people talking and asking about making donations to me because of the site. And it's that which really vexes me. I didn't set out to make a site in order to make money. It seems to make sense to open a donation portal (if only for upkeep expenses), but to me it feels somehow wrong, like I would be betraying the pure intention that drove me to work on Haiku in the first place.

On the other hand, I've come to realize that I enjoy this kind of work far more than I enjoy my current job. I love making things that people enjoy, and also things that people can use to express creativity most of all. If it were at all possible, I would want to make this my career. (I would love to work at Hatena, but it seems like it may not be possible due to my currently low Japanese comprehension. It would be a dream to be able to work on revitalizing things like Fotolife and Star and whatever else they would want me to do.)

I talked to my parents about it and they told me that I was undervaluing my skills and abilities, but also most of all, I wasn't considering the value of my time. They suggested that if I really felt uncomfortable about it, I could open a new account at the bank and route donations into it, and then automatically withdraw the amount used to pay for server costs from it each month. I might choose to do it.

I'm not sure exactly what I'll do. I saw people talking about donations on Haiku and it really forced me to think about it more. 

So I'll think about it more and then probably write about what I decide here.