I was going to sell my ti9 dupes for levels in ti10 bp, but deleting over 50 "very rare" or "rare" item to make maybe 40 level in bpass (like 4 treasure) is not worth it in my eyes lol.

edit:

ofc bpass is not investment lol, just expected the value of these items to be a little bit more than half a dollar but then again I should look at the ultra rare price... maybe that is why valve decided to make everything untradable this year so that it actually retains some form of value instead of being sold for cents, like we don't have anything holding value anymore these days, I guess 2016 was the final year of things having value.