Except when the cost of one self-winder mechanical service can buy 50 batteries for several watches... But yeah, Solar is much more convenient than needing a battery every 24-42 months.
One of the reasons I traded 7 Omega and Tudor watches towards just 3 Rolex in the past year is that I have 4 fewer watches to get serviced every 5 years. That saves me over $2000 over the 5 years of time, and it buys a lot of batteries for a lifetime.
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