The typical Chicago version of this problem is not an absent marketplace presence. It is a marketplace presence somebody else built. A distributor, a liquidator or a regional dealer listed your part numbers years ago, wrote the copy from a spec sheet, uploaded one photograph, and now owns the search rank and the reviews on products you manufacture. Every fix from there — Brand Registry, listing takeover, parentage, A+ content — is a recovery job rather than a launch, and for a Midwest manufacturer that has never treated the channel seriously it is usually the highest-value work in the account.
The second Chicago question is 1P against 3P. A lot of established brands here already have a Vendor Central relationship inherited from a retail-minded era, hate it, and have no model for what leaving would cost. Vendor Central hands you volume and hands away pricing control, chargebacks and margin visibility. Seller Central gives you the pricing and the data and hands you the operational work. There is a real answer per brand, and it depends on your fill rates, your chargeback history and whether you have anyone to run a 3P account properly. We model it rather than declare it.
Then the fee reality, which in this metro is unusually harsh. Grills, coolers, patio furniture, housewares, sporting goods and case-packed food are heavy, bulky, seasonal or perishable, and marketplace fulfilment fees are built to punish exactly that combination. Size tiers, dimensional weight and the fourth-quarter storage surcharge decide whether an item belongs in a fulfilment centre at all — and from a dock inside the Illinois rail and interstate belt, merchant-fulfilled shipping covers enough of the country fast enough that the trade is closer than sellers on either coast assume.