IMO sub-domains are only as spammy as you make them. I frequently use them for forums, admin and members areas and other things like that. I believe that if your sub-domain is related but not the exact topic as your main site then it is absolutely fine to use for promoting. Just use good judgment when promoting, as with any website. If you have a bicycle parts website and you have a debt consolidation sub-domain, something is definitely amiss.
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