Soaking beans once is almost three taels. In fact, soybeans are not so expensive. I have one kilogram of soybeans in 6 yuan, which is one kilogram in 3 yuan. I am in Liaoning. Maybe beans are cheaper? The cost of beans is 0.9 yuan.
The expected service life of a 500-yuan soymilk machine is 2 years, with an average of 0.68 yuan per day.
Roughly estimate the water and electricity in 0.2 yuan.
0.9+0.68+0.2= 1.78 yuan.
But to make 1L soybean milk, put in 3 liang beans 1L water, and the soybean milk is almost 800ML, because there are bean dregs thrown away. Bean dregs can also be used to make some bean dregs steamed bread, but I don't eat it, which is troublesome to make and I personally don't like the taste.
Moreover, it is troublesome to clean the soymilk machine, which costs a lot of water. I don't think electricity is very expensive. The heating is 800 watts, and the motor for beating beans seems to have only 300 watts. I won't count that part. Let's make a rough estimate.
In short, the more this thing is used, the lower the cost. It seems that it is definitely more expensive to use it only for soy milk. It costs 2 yuan less than one liter, which is much more expensive than selling it in the morning market.
Moreover, the taste of soybean milk made by the soymilk machine is not as good as that sold in the street, because you filter it with a net, and the bean dregs feel obvious. People are industrial soymilk machines and filter it with gauze, and the taste is particularly fine, almost like milk, and almost no bean dregs can be drunk. If there is a reliable tofu mill near home, it is still cost-effective to buy and drink and tastes better.
But soymilk machine can also be used to make confused, milkshake, bean paste, which can be used in many places. If the family has a large population and likes to eat these things, it is worthwhile to buy a soymilk machine. If it is a world for two, and you are busy with work and don't like cooking, I suggest not buying it. It is better to buy bagged milk to save trouble and money.
I regret what I bought. My husband and I never drink these things. I bought them because I was pregnant, but I didn't like it after drinking for a few days. Besides, we rarely cook, and he basically eats outside. I just cook simple meals, scrambled eggs with tomatoes and so on. You said that such a big soymilk machine could produce nearly a liter of rice paste, red bean paste and milkshake without any trouble. I can't finish it myself. Make soybean milk once, soak beans for more than 6 hours, beat beans for half an hour, and clean for at least 10 minutes ... There are people around me who buy soybean milk machines, and they are basically enthusiastic for three minutes. After a few days, they put them on hold, hehe.
I hope the above experience is of reference value to you, and I wish you a happy life.