My bow shoots 239fps and I like to see where it hits, simple.
My buddy used to shoot an older bow (3 years ago) @ 175fps and he has tagged more deer than I.
As everyone knows, some of the main factors is shot placement and the attitude of the deer that help dictate weather you connect for a clean kill or not.

Bows are like anything else on the market for sale... People tend to love, and get caught up in, the "stats" marketing and technical sales push too sell their products.
I believe every product may go through a cycle, for a given amount of time, that makes it worthwhile to upgrade down the road. This could be every couple
of years or every decade. It's for everyone themselves to decide when they feel their personal equipment doesn't achieve their results they are looking for?
Or, as an example, you decide you want to make it to the next level, as an example, start shooting @ 40 yards instead of 20 yards and you deem speed to help with arrow drop???