Thanks for the explanations alzander and pinkflower.
The idea for Burst was really to have any spare space you have to mine, not to make mining rigs out of hard drives to make money.
The thing is just... as far as even the PoCC peeps have explained, the mining will not stay profitable for long, since the amount of inflation is getting lower. So something else has to either sustain mining, or pump the use so much that fees make up for it.
Or something has to replace it altogether, while making Burst still attractive. I just haven't seen such plans so far.
I understand that because Bitcoin price is rising almost all alts are going down, but with so many innovations Burst should at least stay on same level (like Syscoin). I really don't understand this dumps..

It takes patience. The last serious alt drought took more than two years. But staying in Burst has paid off brilliantly back then.
The potential is there. But I find the space too unpredictable to know when it will happen.