"why not?" - due to the fact your procedure/software won't be compatible with world wide systems like Ethereum or Bitcoin the place making sure uniqueness of addresses on a worldwide scale is definitely the A significant goal. Here is the issue you ought to be asking - (ethereum.stackexchange.com/issues/3542/�? This commit https://random-eth-address96307.webbuzzfeed.com/30760173/the-best-side-of-vanity-ethereum-address