Drupal a viable platform?

Looking to get into site flipping, from what i could gather wordpress composes the majority of the sold sites. I was hoping to specialize in Drupal, as I find it to be the best constructed CMS. I have one site up with Joomla and have been toying a little with Wordpress for IM purposes. Any thoughts on this? Should i go with Wordpress anyway or Drupal may work? Does it even matter that much the platform the site is built on?

We love Drupal,

However, if you are talking about selling sites, you can work with a CMS already designed for this. We've used Open-Realty for a number of projects (none of which were selling real estate) and really like it.