If 2 is important to you: don't make a dolls site. Making a site and expecting it to be popular overnight, or even after a year or so, is the wrong way of going about it. You should make a site because you enjoy it, and because you feel you have something to say. If people find it boring, they can go elsewhere! Do it because you want to. Not because other people have an opinion about it.

I can name a lot of pros though.
- You learn something useful. Coding, how far you take it, is a useful skill. Learning how to use content management systems or wordpress, that is a useful skill too.
- You can show people your stuff the way YOU want to to be seen. You have utter control over it.
- A site makes it fun to make new dolls, and think up new things to add to your site.
- It's fun.
- It's challenging.
- It's unique.
- Did I mention it is fun??
I enjoy making the site more than making dolls, tbh. Well, I enjoy making the dolls to show on my site. I've gone from handcoding in notepad to tweaking a template for Joomla. I have to say it is easier to update a site that has a decent back end. But even when I was still handcoding my pages, updating and changing was never that difficult.
It all depends on if you can find joy and fun in making a website. If you're passion lies more with just making loads of dolls (which is a good thing and takes a lot of time!) then dA might simply be enough.
But if you can't wait to start up notepad to make a new layout and get excited over div layers and css tricks... *drool* then go, and make a site.
It's just funny that I wrote a little something about starting a website...
It may give you inspiration? *click here*