It has PCIe slots for graphics, so of course no HDMI. This isn't a SoC-on-SBC type product like the RPi. The competitor here is a PC motherboard + CPU combination, not an RPi.
Yes, it will be far slower than a new PC, but this is still pretty damn cool.
To price compare you need to look at a 4+ core processor + modern motherboard + 8GB RAM + 32GB flash (EDIT: 32MB, so meh). I'm sure once you did that you'd find something half the price, but when you consider the volumes involved...
Minor correction: the linked website says 32MB flash, not 32GB. Unless you meant 32GB flash for the micro-SD slot which is presumably sold separately for the SiFive board as it is with the RPi.
I dunno... I mean it's actually smart to not make this a single board machine with built-in GPU, since there isn't really a workable open GPU / display controller solution. So making it a PCIe host that can take any off the shelf GPU neatly solves this problem.
It's a nice product but the RISC-V Pi I was hoping for still isn't here.