Sure enough any custom tuner would want to lower their car for the heck of it. Some even push their suspension units to its limit or rather insanely lower it than it should be. The basic suspension system is composed of the progressive spring, the shock absorbers, leaves and torsion bars. Leaves are generally used for vehicles that carry huge loads, so let us focus more on the conventional car suspension system.
Basically, springs are designed to recoil when you hit a pothole or a bump. This helps the tires keep its traction on the road for better handling. Lowering the spring in a cheap and dangerous way may involve clipping or cutting the stock spring. This will result into initial savings since there is no need to purchase a lowering spring, shock, and camber kit or a long steering arm. But the trade off would come in a few weeks time since the shock would initially be compressed. So when you hit bumps and potholes, it would compress even more and would burst. Also, a misaligned camber or arm would result into an uneven wear on the tire. The wear would be more evident on the inner side of the tire since it would look like an inverted V if you look up front.
Lowering your tire the right way would mean that you have to buy different aftermarket parts which are expected to be a bit pricey. Your next probable question would be on "what and which brand to buy?" Go with the OEM aftermarket parts. These people know the car's design and have built them in accordance to the car's specifications, so a perfect fit would not be that hard.
A reminder though when choosing which kit to buy is to buy the kits that are specifically for street use if you will be using the car on the street since this should be a bit higher and softer than the racing kit. Racing suspension kits are intended to be very low in order to get the car's center of gravity low to make it more stable. Since race tracks normally have even surfaces it would be perfect to use a very low suspension system.
A couple of things should be remembered before you splurge on that aftermarket lowering kits. Try to take a ride on a lowered car and feel the handling as well as the suspension. Keep in mind that altering the suspension system will cost you an uncomfortable ride since the dampening system will be set to hard so that the tires will not come into contact with the car chassis or the fenders.