... - It's not because 'I didn't want to' because I usually answer all the Inbox Messages I can see

So If I haven't answered Your Message for More than An Hour or Two since your posting it - the Reasons may be:

1. I'm offline at the moment, so Idk that you sent it - but I will answer when I log in again & notice it

2. I'm updating My Books now & haven't noticed your Message Yet - but I will answer it as soon as I can

3. I'm Sleeping - so I will answer you tomorrow 

4. You said something Idk how to answer so I am 'thinking how to reply'