Yes, assuming that they have a realistic prospect of getting it in their lifetime. I would certainly expect that there would be a far greater incentive to seek programming, get help, and get treatment if you have a prospect of getting parole, even if it is 25 years out.
I can tell you that offenders are very aware of their parole eligibility. They will look ahead a decade or two and think, “I need to behave myself; I need to do as I'm told in custody; I need to obey the rules, and I need to get treatment and help”, because they're looking 10, 15, 20, or 25 years out and thinking that they are going to want get parole one day. If the parole ineligibility is 35 or 40 years, it's hard to see what incentive somebody has to make arrangements for when they're 70 years old, for example.