Jim, 100 hours is indeed a fair season of motoring for sailors in a number of seasonal areas, including your own. E.g. Northern Europe, where saildrives were introduced in sailboats with commercial success, provides a challenging environment for recreational sailors to get in even 100 hours.
OTOH think about Gulf Coast sailors who often see light winds and long seasons. Or Southern California''s bazillion sailboats which sail all year long. Or any poor Snowbird who hopes to go down the ICW in the Fall with plans to tour the islands and head home in the Spring or Summer. And we should probably count any Chesapeake sailor who enjoys sailing, suffers thru the hot/humid light winds of summer, and who isn''t punching a timeclock. These and other sailing venues (you''ll notice I haven''t even mentioned south and west Florida) don''t IMO fit the 100 hour time clock ''built into'' many saildrive installations...but don''t look for the boat builder or broker to call this to anyone''s attention, as it simply isn''t their concern.