Look at the price of a regular SAN with regular disks. It still can't compete on price! I did a price/performance comparison of a single MSA70 (25 disks) to an EVA3000 - it was 8x cheaper per MB/s. And that's a really cheap EVA. As you move to bigger SANs, the cost per MB/s gets higher still - they're not designed for high performance service levels to an individual server.
i don't know about EVA, with with higher end EMC SAN's you get some nice software, and the ability to replicate data on a disk level to a DR location. and the build quality and support is top notch. if you have a bad part, you won't know until you get a call from EMC telling you to be onsite for a delivery in a few hours.
I deal with HP support for servers and a backup tape library. overall it's pretty good, but sometimes i have to waste time taking a server down to run diagnostics, switch out memory to different slots, CPU's to different slots, etc.