HD-DVD versus BD-DVD (the war at home)

People do not want to spend so much money on a kind of DVD players which will be antique several years later. However, both Blu-ray and HD-DVD arrived in stores this summer. Blu-ray discs will not play in HD-DVD players and vice versa. How do the consumers choose what type of DVD players they use or whether or not they are going to switch their old one became big issues. In my own opinion, even though inventing new productions will perhaps costs more than update, the manufacturers can gain more, considering of the long run because people do not like purchasing the same thing twice. My question is why do the producers update DVD instead of invent high technical productions.