Mobile Phone Contact List

So, I decided that I should back up my contacts list from my mobile phone
in case of the "inevitable" should happen (dropped in toilet, lost in cab, lost at the pub, etc).
I navigated through my list of contacts to realise that out of the 280 contacts listed, 
I have probably spoken with 40, at best, within the last 5 years.

How have I managed to hoard these numbers & not complete an annual cleanout of these digits?

More to the point, am I bad person for not reaching out to the remaining 240 or so, and dropping them a simple "hello" over the course of the last couple of years?