???????? Are you saying because someone spends more on a player, they are more willing to spend on disks??? The reality doesn't match your argument, as has been proven wrong with releases like Matrix and Planet Earth.
No one is denying that Combo's cost more, but rather that the SD version will not be included with the BD set. If the SD is to be included in the HD version, then it will probably be included in the BD version. Combos in the HD, separate SD disks in the BD. Why would you think that feature set...