I definitely do my part...typically a hundred at a time.
Seriously, we are definitely about to lose our small businesses. They cannot carry a reasonable inventory of quality goods without pricing higher than a chain store. Remember as small businesses, they still have expenses like the rest of us: utilities, rent or mortgage, plus personnel, bank services, advertising, cleaning, tax servicing, landscaping, insurances, snow removal (in 50% of the U.S.).
Plus you get personalized service where people try very hard to remember your name, ask about your project, and answer questions about machine quirks, sewing techniques, new products and suggest easier ways to do something, or alternative pallettes for a quilt. Many LQS employees have also been sent to special training (such as "thread school", digitizing, etc.)
Each purchase helps keep them going; so even if you pay 20c more for thread, it will keep an LQS in your area.