Is long-term care insurance a luxury product? Today, most policies covering home care and assisted living and nursing care facilities for the elderly are purchased by people with relatively high earnings, according to a new survey. Long-term care used to be insurance that the middle class would buy – either individually or through an employer, union, or affinity group – when it was more affordable. But the market, which has contracted dramatically, also seems to be shifting, according to retirement experts and new data from LifePlans, a long-term care research firm. In LifePlans’ survey, 82 percent of the people who purchased long-term care policies in 2015 earned more than $50,000 per year. In comparison, only half of the general older population…