You're right, allowing URL can be hard because there are those who provide them only to get users, but it can also be a resource for someone. We can't provide everything as much as we would like to. Some suggestions can be:
1. Provide an area for it, or
2. Give specific rules on how it can be used.
On my site we have a classified section to allow businesses and personal sites (Items they make) to post their URL, otherwise in our forums the signature link is disabled, except for a section for forum owners.
Also people can always opt to PM if they are truly trying to be helpful.
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