actually it just happen naturally.
what is a lucky number? its a number that brings luck to you? or you personally experience something lucky which related with that number, or simply because of that particular numbers follows you or appear in your sight or related with anything about you in your life. So of course indirectly you will fall in love with that numbers.
another reason would be the financial value, the intangible value which recognize by the society.

Its just a natural habit, human being tends to avoid anything which related with something they fear with. Such like the number of 4 for chinese, it is natural for human being to fear of dead, so indirectly we, the human will try to avoid them.