Because there’s no real way to adequately test them so you can sell them at various price points.
If you have something that people don’t know a ton about (so not milk, say) and don’t use a ton (so not tools) it’s very easy to get a wide range of prices. Most people will skip the $30 (obviously it’s crap because it’s too cheap) and some will even but the $600 (it must be the best because the most expensive).
And likely the only difference is the number of attachments or something.
If you have something that people don’t know a ton about (so not milk, say) and don’t use a ton (so not tools) it’s very easy to get a wide range of prices. Most people will skip the $30 (obviously it’s crap because it’s too cheap) and some will even but the $600 (it must be the best because the most expensive).
And likely the only difference is the number of attachments or something.