The purpose of marketing at the level of the independent operator is simply to promote and scout for business. It would be ideal if one could hit the jackpot each and every time with those needing the service immediately.
However, some potential customers might have a need then and there, some maybe later, some will be tire kickers, some may refer others, and quite a number will likely ignore it.This is the nature of the beast.Some say one of the principles of marketing is that an audience will need to see your message at least three times before it 'registers'. And for independent operators, this also means having to spend 50% of all their time engaged in all forms of marketing activity.
If the 'thousands' you are referring to are from the bottom dwelling 'seo merchants', then I think that there is enough commentary in the freelance forum to indicate that these are very low paying, and mainly for hobbyists and newbies.
ATP