Nah, you can totally have sales without a product - it's just not very sustainable.
It's a little tongue in cheek, but I think illustrates a real perspective - improving a product doesnt necessarily extract more revenue from existing customers. Selling more copies does extract more revenue from existing products though.
Indeed. Not long ago our sales team was our existing customer base. Users would call up their friends who work in other companies and tell them "you need to get this software".
We've since added a dedicated sales person, but we still get a significant amount of sales this way.
It's a little tongue in cheek, but I think illustrates a real perspective - improving a product doesnt necessarily extract more revenue from existing customers. Selling more copies does extract more revenue from existing products though.