The reason many folks are reluctant to buy a used life raft, is that life rafts have a limited life. Some brands (Zodiac) are/were condemned at 10 years of age, used or not, regardless of condition.
So while you're raft may be certified until 11/11, the question is, how OLD is it?
Take the price
of a comparable new raft, subtract 10% for each year of age, and sadly, that's what a used raft is worth--at best.