Is there an argument that as an end user it is better to buy a CCTV kit from a wholesaler and then install the system either by yourself or get an electrician to carry out the work? Well it would save on costs there is no doubt about that. But CCTV kits available on the Internet tend to be imported from the Far East and tend to be of a lower spec than a CCTV installer would use.
For home CCTV it is defiantly a market that is growing, the average domestic customer is simply looking to install a CCTV system to enable them to see who is there without leaving the safety of the home. To this end the CCTV systems that are available in Kit form will suffice. Commercial users though often have CCTV cameras installed for more reasons than just observation purposes and this is where good recording and quality cameras will make a difference.
Most companies have little or no resources to just have someone watching CCTV images, so inevitably all the information that the CCTV system gathers will need to be reviewed from a recording. This is where the main difference between CCTV kits and a professionally installed CCTV system will tell.
A CCTV System in kit form will have little or no flexibility on the number of frames per second it can handle or the image quality unlike a more expensive DVR solution. Lets be honest though some high end spec DVRs can cost upwards of £6000 they will have many features and some of these would be over the top for many small or domestic installations.
At the end of the day when buying CCTV kits you really need to think hard about why you really want it, to observe or to actually produce usable images after an event has occurred. Review what is out there and take advice. It could save you spending hard earned cash on something that at the end of the day turns out to be a white elephant.