I think that Mrs J has a valid point...

... which is, the easier you make it for the ECO/ECM officer, the easier it is
for him to approve the visa application.

If u don't show "reasonable" savings, then there is more likely to be a larger investigation into your job
and current financial situation.... ie if you are showing high income, then why no savings (that's
a question that I would ponder on).

... no savings then leads onto your accomodation.... is the mortgage above your means, is the rent
too high etc etc .... one thing leads onto another.

Also, no savings = the possibility of relying on the state in the "bad" times.
Again, this goes against the terms of the visa. So they want to avoid that situation.

All these things are inter-related. One "negative" (no/little savings) impacts across the whole application
& starts them questioning many other things.

I'm not saying you HAVE to show "reasonable" savings..... but I'm sure it hurries the decision along.

... and £5k . huge ? Low in my opinion