You don't get opportunities and experiences without wealth. Try asking any poor person about the experiences they have not had. I know people who've never had foreign holidays in their lives, who have not had any holiday for 5 years or more
That is a strange definition of poor! I wouldn't see going without a foreign holiday, or any holiday as deprivation. There are times in my life when I have, and times in my life when I haven't had holidays for 5 years or more.
I think it is down to attitude to some extent, whether you consider yourself deprived. My childhood was "poor" then my parents got richer, then my children have experienced a "poor" childhood, but I would never have considered us deprived.Struggling to pay the bills and that being the "norm" would have been my experience as a child, and my DCs experience too, being a single parent family, but we are not "deprived" and never have been.
I have certainly never felt any learned hopelessness, nor seen any in my DC!
I agree with you that learned hopelessness does exist, though, but I would suggest it is often a choice, rather than a necessity to feel it.