Why should I pay someone for a marketing plan?

You are essentially learning from their mistakes. Publicity, awareness campaigns and purchased advertising can all guarantee impressions. We need to make sure you are creating the right impression and most importantly, achieving conversions.

How do I know this will work?

Nobody ever knows. The proven method is to start with small commitments and run split tests. Which ever one yields the greatest results becomes the official plan. Then people pretend they knew all along.