You might not have access to the data sources, you might not have the context to interpret them in a meaningful, and then the company you are targeting is probably your only potential customer (or you have to cold sell to every competitor, so now you have a sales job, right?)
Also, after a project fails the business is always close to 0% likely to work with you on it, even if it isn't your fault (I was brought in as a clean-up man and my billing was insignificant).
You might not have access to the data sources, you might not have the context to interpret them in a meaningful, and then the company you are targeting is probably your only potential customer (or you have to cold sell to every competitor, so now you have a sales job, right?)