Quoted from Aeolus7:Question is what are you looking for? If you are looking for someone who shares your identical hobbies, you've just greatly narrowed your dating pool. I would say seek out someone who is genuinely supportive of your interests (and you in hers). Shared interests are a bonus, but if she doesn't live and breathe pinball, it really shouldn't be a deal breaker IMHO. My wife and share a love of food and netflix, but that's basically it. Even so, I've never had more fun with anyone in my life (married 6 years, together for 16 years). When you are with someone for a long time, I think it's more important to have separate (and shared interests) to keep things fresh and preserve sanity.
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In a healthy relationship you should just be generally supportive of each other and each other's endeavours. Some crossover in hobbies is great, but not necessary.