I/Os systems take up valuable cockpit space on a small boat. The system weighs much more than eqivalent OB power. They are generally less fuel efficient at a given speed and corrosion issues make them unreliable unless you spend more time or $$$ on prev maint than an OB.
Try to find someone that has/had a small boat I/O that prefers I/O over OB. I've found that only water skiers liked them better (motor weight is centered = less wake and leg lifts in shallow water), but they generally only use them in FW where corrosion is not a big issue.
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