I just posted the same question regarding the price of $149.99.
I think it is too much to ask as well. I own all extensions which i paid more the $500 for, i then upgraded the same extensions into design extender $39.99 just to have the same extensions (which i already paid) into one installer.
Now i was hoping that all other extensions which were not yet inside design extender would be added/upgraded over time. This way all extensions would become available in one extension. However now you come up with a mirror version of design extender which holds all the other extensions (which i also already own and paid for) and then ask a non fair price of $149.99 again.
Please think again. Also what will be next, a combination of design extender and data bridge into one extension for $299.99??
I hope WA will come with a decent upgrade price for this one. I really would like to pay for the effort the team is doing to improve but for a decent price (like design extender was just ok).