Aside from risking the sanity of your computer, one of the biggest reasons why people are not so keen on purchasing a registry cleaner is its price. However, some companies have different methods to convince customers, such as keeping the price as it is but allowing users to install the registry cleaner on multiple devices.
Uniblue, the company behind SpeedUpMyPC, uses the above method with a nice bonus. If you become a customer of this company and subscribe to the annual plan of SpeedUpMyPC, you can not only install the software on 3 PCs at the same time (for just $0.83 per month per computer), but you are also given a free lifetime SystemTweaker subscription as a little bonus.
Invest in the annual subscription of SpeedUpMyPC and pay only $2.49 per month ($0.83 per month per computer) to get a license you can use on 3 PCs at the same time.
Purchase SpeedUpMyPC, and Uniblue gives you a lifetime license of SystemTweaker, another computer optimization tool completely, free of charge.