Profitable to run a vacation rentals site ?

I've completed the article on the Vacation Rentals industry and published here :
http://www.compareownerholidayrentals.com/article-vacation-rentals-by-owner-business.htm

I would welcome any comments, particularly from anyone running a site themselves. I suspect there are many people our there who run FREE vacation rentals sites :the upfront costs are so low that it's an easy business to get into. Also, the prospect of getting an income from an online business that could be located anywhere is very attractive, and the downside risk is so low, why not go for it ? As supplemental income, it's all upside !

However, I wonder how many vacation rentals site owners can actually make a living from their vacation rentals sites ? To get an income of $50,000, you need to find 500 owners who will pay you $100 per year, above any marketing and hosting costs that you incur.

If you have a story to tell, whether it's a success story or otherwise, please let me know !

Regards,

Kevin