Nothing surprising: they are comparing popular, well-known brands. Of course, there are many other, lesser-known VPS providers with better prices.
Additionally, www.time4vps.eu can't be really compared to DO/Vultr/Amazon, since they use OpenVZ virtualization, so you're getting not a full-blown virtual machine, but a container, running on their kernel. OpenVZ VPS are usually cheaper than KVM/Xen.
Funny related story... When I first heard of a KVM switch, I thought KVM was a reference to Linux virtualization. [1] I was a non-techie working at a cloud provider, and virtualization was discussed regularly. I only realized a couple months ago that it a KVM switch was referring to keyboard-video-mouse, which made a lot more sense.
Additionally, www.time4vps.eu can't be really compared to DO/Vultr/Amazon, since they use OpenVZ virtualization, so you're getting not a full-blown virtual machine, but a container, running on their kernel. OpenVZ VPS are usually cheaper than KVM/Xen.