Well two things that stand out to me, define for us "years" and as already asked, under what conditions. Some of the other comments that have run slicks for over a decade, neglected to mention how often the tires were run. From my experience, which is true it seems for many things in life, worse thing is sitting/neglect vs regular use.
Second, which is very much a current topic of the day, peace of mind and spending $850 on a new set you MAY NOT use next season, vs body damage to yours and maybe another's from a failed slick on track and the downtime and cost for repairs, aggravation, and mental anguish for making the wrong choice, etc. ie its all Risk vs reward, only you can decide.
Me, a new set and not look back.


Reality check, that half the population is smarter then 50% of the people and it's a constantly contested fact.