slapass,
I think the advice is, don't get into a business that you have no idea how it works. Know the ins & outs of your business. Know, from start to finish, how to produce your product/sale, your costs and find the loopholes in between. You can be a great marketer and sales can be greater than ever, but if you can't distinguish how your partner is screwing you, it's all in vain.
Edit: At least I think that's what he's saying
