Amazon Prime customers are very important criteria.
To enter the Amazon prime category, you need to send your products to the amazon warehouse.
If the product volume is large and less than 20 orders per day, you can ship from your own warehouse.
Many customers buy from amazon itself or amazon fulfilment sellers because its quick delivery.
I ordered some items Monday morning around 5am. Half of what I ordered was delivered same day, most of the rest the next day. One item I'm waiting till early November for.
If i ordered now (5.44pm on a Saturday) I'd expect delivery tomorrow.
Fulfilment by amazon costs you control as you don't get to decide anything. Does mean someone else is packing and sending the item.
I used to do £20k plus a month in sales, most via amazon fulfilment. Went into hospital for a few days, orders still got sent out.
And the financial costs overall was lower using amazon than sending myself.
Its not suitable for all product types and can have additional costs to prepare stuff for being stored on shelves and sent out by people whose goal is to pack multiple items per minute.
A chunk of what we sold was fragile so we prepacked to send to amazon in suitable sized boxes with masses of padding. Cost us financially and in time to prep, zero returns for breakages on those products.
Also used to sell the same products on ebay. Using amazon as a fulfilment house for the product. Sale on ebay, tell amazon to send our product to whatever address, item delivered. Costs more that way but again someone else doing the packing and shipping.
We had a 2 person business doing 100 plus hours a week at busy time and would have needed several staff employed (with all the headaches that has) at a cost of thousands a week to do what amazon were doing for us for below our royal mail cost per item.
Amazon are not the only fulfilment business out there, can be worth checking others. When amazon get things wrong they can be very wrong.
Including items sent in no longer available to sell due to hazardous materials like cardboard, silk, paper, cotton and wax. Resolving problems with amazon can be a pain.
They still send me notification of items held in their warehouse that I need to action to remove or destroy. Over 6 years after my company was dissolved.