Is Drupal a viable business model? Or is WordPress better?

I know the question may seem shocking as Drupal (and WordPress) is open-source, but hear me out.

I make a living out of developing websites and I've recently started my own company. I used to work in web agencies where different types of people would handle the different aspects of a web project (design, coding, project management, etc.). I used to be part of the coding team but now that I'm on my own (I'm a 1-person business), I can no longer spend as much time on the coding and I'm getting tired of re-inventing the wheel every time.

Which is why I started investigating open-source CMS, and more specifically Drupal, which provides a number of out-of-the-box features that most websites need and that I would no longer need to code (but could customise if needed).

Taking this one step further, I was thinking, why not reduce the coding part even more and become a Drupal service provider (ie. sell packages containing Drupal + hosting + support) instead of custom developments. My clients would then be able to do the customisation themselves should they want to. Or I could still provide my services as a "consultant". To see what I mean, have a look at Bryght, they are what I would like to be! ;-)

With this objective in mind, several arguments speak in favor of using Drupal:

1. It matches my core skill-set (PHP/MySQL).
2. I like the product. What it does, how it does it, its flexibility.
3. I like the Drupal community. The leaders (or should I call them mentors?) are people I admire, as well as the whole community for the great work they have done so far.
4. I like the idea of being part of a community. It never happened to me before; I was only "part of" the companies I used to work for... shame, isn't it? But contributing, helping in Drupal development, and the whole idea of open-source in general all appeal to me.
5. I like the spirit of Drupal. This last point is totally subjective, and probably a combination of all my previous points, but Drupal has - in my opinion - a "cool factor", something that makes me like it. That's not to be neglected if I am to spend the next years or so working with it.

With so many "I like" 's, you might wonder what I'm getting at. :-)

• Is it a viable business model for a company to sell Drupal-related services?

  It seems that selling services or hosted software is the way to go for any company doing business in open-source (RedHat, Bryght, Zimbra...), but is there actually a need for these services when they are around a product like Drupal? Sure, people need websites, but companies use web agencies, individuals use blogs, geeks install Drupal themselves... Who would be the typical client of a company selling Drupal-related services?

• Then there's the marketing aspect. Isn't Drupal hard to sell?

  At the moment, blogs are hot. People want them (it seems), they know what they are, they know how to use them, they "get" blogs (or do I live in geek-land?). While I'm sure Drupal is much more than a blog software, isn't the whole functionality it provides overkill for most users*? It makes Drupal more difficult to understand for the end-user and therefore more difficult to "sell". It doesn't seem to be the case with blogging software like WordPress which as a reputation for easiness and usability (hence the title of this post).

In other words, when you're in the business of building websites, does Drupal provide the kind of website (all aspects considered - features, usability, design...) that most users* want and exactly that, no more, no less?

I'd be curious to know what you all think about this.

(* By most users I mean the typical target of a web hosted service : associations, SMEs, professionals, maybe some "power" individuals, but not big companies.)