No, not really any reason you can't. BUT, if one of the items connected to your battery is left on (like a radio or chartplotter of whatever), and you're gone for a long time (like over the winter).. you could return to find your battery is completely drained. A battery switch is more than just an on/off device. It's really an isolater. preventing your battery from running down and your electronics from getting fried.
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1987 V20 w/1987 150HP Yamaha on a Shoreland'r Trailer
1978 16.5 Airslot w/1996 120HP Force on a Four Winns trailer
1996 V21 w/1993 200HP Mercury on a Shoreline Trailer
All towed by a 5.7L Hemi Durango.
If God didn't have a purpose for us we wouldn't be here, so
Live simply, Love generously, Care deeply, Speak kindly.
(Leave the rest to God) 
Silence, in the face of evil, is itself evil. Not to speak is to speak, not to act is to act. God will not hold us guiltless.
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