This is very important. Improper setting of prices can lose you money.
MFI allows you to markup your cost by percentage, say 25% above cost. But it also allows you to markup by a fixed $ amount. It also allows you to do both at the same time.
Why is that important? Because different distributors have different thresholds for handling cost. For example, a distributor may charge $7 per order as handling charge on orders below $100 and $2 for orders over $100. MFI allows you to define your margins by price tiers to protect your profits.
Because the lower your cost, the more competitive your prices. Translates to greater sales and greater profits.
Markup prices at cost + % or cost + $ or both. You can markup prices differently for different distributors. You have total control over your selling price.
All products don't ship equally. You can apply shipping markups in addition to price markups to come up with a selling price that takes all costs into account.
If you don't want to sell a product or a product category, you can simply block it and it won't get downloaded to your database.