It's always best to try to obtain IBL's from related pages but you can't control who links to you, so it's unlikely that you'd experience any penalties just because you get IBL's from unrelated sites.

Unless you're buying tons of links or listing in blacklisted link farms, I wouldn't worry too much about it.

Keep on fighting the good fight. Even if links receive the "nofollow" attribute, they're still likely to generate some traffic and that's what really matters.

Like I said, post some articles and participate in online forums. You might even consider placing swapping some ads in related sites such as ecommerce sites that cater to bikers, musicians, exotic dancers, etc.

Because there are so many low quality sites in your niche, you're going to have your work cut out for you.

I'd try this:

Make a list of your top 10 competitors. Snag their URL's and find out where their inbound links are coming from and try to get listed there as well.

Use the link operator and their URL in Google to make a manual list and knock them off one by one.

For example, enter this in the Google search box:

"link:http://www.competitorsite.com"

Alternatively, you can use a free program like WebCEO to make these lists quite easily. Enter in your competitors URL's then let the software find sites linking to them.

You'll be able to visit the URL's and look for their link exchange or submission form.

It's extremely time consuming but it does work well.

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