A recent study indicated that 56% of business customers use mobile technology to search/book hotels, "indicating a rapid increase in the use of mobile technology in the business travel sector".

It doesn't mean that you should create an iPhone / Android app for your business (if you have the budget, go ahead) but at least optimize your website. If vacation rentals want to compete with hotels they surely need to stay ahead by allowing their customers to effectively browse their properties and make a reservation.

Sure a lot of vacation rental businesses need first to improve (or create!) their current website. But to make a website mobile-friendly is such a small investment, so why not make it?