La Liga is broke unless you're Barca or Madrid, so hard to pin it on being poorly run. Lot of clubs in the country seem to be suffering similar problems. Sevilla don't seem to have spent ridiculous money at any point, but the share of TV money which makes up the vast majority of PL revenue just isn't anywhere near as lucrative over there.
But still, as a Sevilla fan you've watched the club lift a whole bunch of trophies, financial issues can't take that away. Surprised this is all rearing its head now, so soon after the big Kounde transfer, winning the EL prize money & qualifying for the CL. Surely that's helped them out a lot?