Once they go the way of sli.mg .... there is no recourse.
I would like to delete my account there as well. Just because if I don't, it feels like I am leaving a mess. Consolidate my online presence and all.
On reflection, I think it's pretty clear Puttitout wanted to wash his hands of the site completely for the short term. I wouldn't expect much in the way of fixes until the money runs out. Also bear in mind all the preview sites(4?) have your data on them as well, and suffer from the same bugs.
Whatcha wanna do that for?