I've never had any desire to jump out of the back of a plane .....
But it strikes me from sites such as the following one that I came accross after a brief Google ....
http://skydivingfatalities.info/sear...lace=&State=TX
That it is a pointless activity carrying a shute if you are unable to start the deployment process at a sufficient altitude. Otherwise if your main fails, you could find yourself back at square one because you had insufficient height to deploy the reserve. Similarly, if your lines get tangled, you could find yourself with insufficient height to untangle.
As I said though, I've never done a jump .... so I'm welcoming corrections to this post from those who have.