Should I switch to VPS now?

I have between 15 and 25 Wordpress based websites at all times. They are not very busy (some get 10 visitors per day, others get 500).

I am currently using HostGator shared hosting for $9.95 monthly and I am paying on a month by month basis.

However, this price seems too high to me for my needs. Don't get me wrong. I can afford this price. I can afford twice that as well, but as long as it's worth it and it will really make an impact.

My question is, is it worth it for me to switch...

Should I switch to VPS now? WordPress ...