Interesting reply. I don't give a rat A$$ either, DR taxi are ripoff and I never liked them. They don't treat tourist right for years, I've been to DR for 5+ years and hated it and that is why I always have my wife's family pick me up. I want a decent express bus service just like in the states, simple as that. Why I am charging $5? That's more cheaper than Taxi $30USD (average).
ROI? A decent bus can carry 64 passengers at one time, that is $320 dollars for one bus trip. Remember, it's a EXPRESS not like the SD city bus. Which means each bus will generate $14,321 every time. If it operates every 30 minutes say 5:30am till maybe 11pm, your looking at approx 35 trips a day which means $14,321 x 35 = $501,321RD daily. That will be enough to cover for gas and employees driving the bus. The rest will be save up in the bank. Now if it will operate 7 days a week, 365 days a year. Your looking more than what's worth than what I paid for, $50MM.
Now, that's ROI. Way more than Taxi's revenue!