Wonder how many "motor" boats actually get over 100 hrs a year use.... even 50 hrs annual use for that matter.
I fairly often drive over Golden Gate Bridge [and other SF Bay bridges too]. Tiz a pretty great view of the bay off all bridges. Seldom can I count more than a couple to a few motor boats in the water; no matter what day nor time of day. Weekends [in select locations] sail boats can be seen; most going to no where - but, their crew and invitees seeming to really enjoy going around in circles!
I also notice plenty of marinas while passing over bridges... they are mostly completely full during all occasions. Our two primary marinas are basically filled to their brim with "dock queens". Besides ourselves... few and far between are the boats that go out.
Which brings me to this question... How many "pleasure boat" owners will either want to or need to alter their boat's props for these new style Sharrow props that cost an extra many thou$and of dollar$ each?
For working boats I can see the market! For super rich boaters with big, fancy yachts I see a market! For racing boat owners there is market! For sports fishers that are in competition, wherein speed to fishing grounds is a factor, the market will grow.
However, for the general boat owner [I'd guess 95 to 98% of the boat market] I see little to no market developing unitil Sparrow prop cost comes down and there becomes a readily available way for prop shops to repair these new design props if damage occurs.