Well, there are several reasons

First of all, we get tens of thousands of visitors every month, so it is true that many people read but do not comment.
Many people are too busy to leave comments. Many people rather spend time in a virtual world than preparing for a real trip... many people that 'do not have time to climb' spend days on FaceBook and Twitter.
Also I have restricted posting and registration as the spam was getting too bad. Nowadays more than 99% (!) of new registrations are spam, so I only approve once a month or so as it is still a lot of work.
I am working on a major, major update of 7summits.com (a rebuild actually) and as I also have to run a business and do a million other things, this is not finished (and it will take a while), so it is also my fault.
I answers literally dozens to hundreds emails per week which always get priority, so at least there are still many people with good dreams and funds to follow through.
Mari, looking at your forum signature: when are you going to Muztagh Ata

?
Cheers, Harry