As a consumer I know it is easy to make mistakes when buying on line, so I look for a well known name. Does not matter if that name is Tesco or Amazon I want a well known name. If I am going to buy on line then I want to save money. I don't mind spending a little extra in local brew shop he gives me advice, but on line knowing you will get what you have ordered and getting it cheap is all you are looking at.
The likes of Tesco and Morrisons have a bit advantage, they already have a distribution network, so I order on line, then collect in the shop, no waiting in for the parcel to arrive. I can collect at 7pm if I wish. Where Tesco and Morrisons fail is they only provide a part service, you get the can but not the bag of brew enhancer to go with it. So you travel a little further afield and go to Wilko and pick it all up off the shelf.
Where Wilko fails is no one to give your advice. One would hope when you go to a brew shop and say I am looking for something new, I fancy trying a Youngs Scottish heavy or a Coopers English Bitter the shop owner should point out the former needs 1.5 kg or fermentables and latter just 500 grams of fermentables no one will point that out in Wilkos. Also that Light malt should be used for latter not Medium.
To an extent even Amazon has a prompt that people normally buy xyz when buying this product. But in general for service you go to shop, for cost you buy on line. The problem the shop has is people who go to shop to look at the product as ask questions then buy it on line.
So what can you offer, can you buy kits cheaper by buying in bulk, or collecting from manufacturer? If not give up, now a delivery service and a shop may work, and it is not only brewing, I knew a guy with a haulage business, where he found back loads for other hauliers, but also ran a small fleet of his own, his wagons actually lost money, but fact he had his own wagons resulted in the other hauliers trusting him.
Having a retail shop and doing on line gives the on line a trusted look, see how many on line businesses have pictures of their retail premises. I did consider making up fridge controllers then Inkbird arrived and kicked that to touch, I could not build them for that price, and could not do such a pro job.
Yes I could find a donor fridge and build the STC-1000 into it, but how would I deliver them as a reasonable cost? I don't think you can get supplies cheap enough for it to work.