@AnacondaHL You can sell the robot first with hard thighs, but then advertise soft thighs to the buyer. Since the robot is apparently astronomically expensive, most people likely would buy a skeleton model, barely affording it, but eventually they will start to miss the options, such as soft thighs, and they will hand over even more cash to the manufacturer. So, you've emptied their bank account twice already. And more times in the future. Few people could afford to buy the whole deluxe set costing 7.5M yen, so they would buy one or two upgrades at a time, over the years, when they have saved money. The battery capacity is also quite pitiful. I bet you could double it by forking out some grotesque sum, like 300,000 yen.
Business is business!