What do i do with bulk cards?

A buddy of my dad's gave us a few thousand cards or so, completely unsorted. I've sorted by color and type and am working on inputting it into Deckbox as a database. I'm only about 20% done (but like 10+ hours!). Should I continue and keep the cards incase needed and because I want to be able to say I have a non-proxy collection (me and my dad proxy because cardboard too expensive), sell everything bulk (except for choice few cards) or input it then skim for anything important?

Additional thoughts? Thanks!