Doubling/increasing manufacturing capacity is usually a very expensive proposition, and requires new equipment, increased warehousing for raw materials storage, etc. It may be limited by whether the manufacturer has the physical space to expand. If not, then you have to buy or lease a new building. Then there is the need to hire and train new qualified employees in an environment where people are not anxious to go out and actually work. Finally, you don't want to expand to satisfy short term needs only to find out a few years later that for one reason or another, demand has dropped and you are now sitting on an investment not making you any money. Expanding is a gamble in many cases, and if they can just push out production and people will still buy, that might be a low risk, good enough solution.