as someone who rides a 'proper' motorbike (Honda CBR 600) when I'm at home... The difference would have to involve me being paid a *huge* amount to make the difference worthwhile!
Unless you are an experience bike rider all year around, I'd have to question why anyone would want to be on two wheels in DR, especially if they can afford four? In shorts and no helmet, with crap roads, poor standard of driving and goodness knows if/when an ambulance will turn up... ask how much is your head worth?