I'm coming late to the discussion but I wanted to chime in.
This bestcomic guy has some good points, and generally I think he's got the right idea: If you want success you need to have a business plan, treat your comic professionally, do quality work consistently and (perhaps most importantly) promote the hell out of it.
Now, I went to his site and I'm not sure what he's trying to accomplish there. The one thing I did see was that bit about whoring out characters for product placement sponsorship. I suppose that could work for some strips - it won't work for mine, unless there's someone out there hawking magic swords.
I actually would counsel against this particular means of getting revenue for two reasons:
1) It is the most insidious form of advertising there is and represents a negative trend as far as regarding art and design as merely a vehicle to sell other products, rather than art and design as a product in and of itself.
2) In my opinion, it cheapens your character design and pollutes your artwork, reducing the overall quality of your product. That's self-defeating, because it will negatively impact your audience, and in the world of self-publishing (which is what webcomics are, essentially) you should be considering your audience as your primary customers - NOT your advertisers.
Looking for a successful business model for webcomics, I would look towards the ones who are successful already. THey may have all come to their success by different means, but if you look closely you will find that they all maintain their success in a very similar fashion:
Sluggy Freelance
Penny-Arcade
Megatokyo
PVP
Homestar-Runner
They all use various combinations of the following means of generating revenue:
1) Advertising. This is the poorest means of generating money, but also one of the easiest (provided you have a sizeable audience). The most successful sites in this regard are those that only accept advertising which is of direct interest to their audience.
2) Donations. None of the sites listed above are using this model currently, but most have used it at some point in their careers. This is an option for an up-and-coming site that is struggling to get to the level where it can get into merchandising and other forms of revenue generation. Pledge drives are a stop-gap measure to help keep you going while you develop other revenue streams.
3) Merchandising. Didn't you guys see "Spaceballs"? This is where the REAL money is made!
Books. Shirts. Mugs. Figures. Plushies. Hoodies. Bags. Whatever you can stick a logo on is fair game. Again, the best thing to do in this regard is to target your merchandise towards your audience. Sluggy Freelance partnering with Cheapass Games to produce a Sluggy card game = brilliant move. Which brings me to:
4) Strategic partnerships. The guys from Homestar Runner are working with "They Might Be Giants" and have just produced a video for them. I can't think of a more perfect cross-promotion, not just in terms of business moves, but in terms of a perfect artistic combination.
5) Exclusive content for sale. Sluggy has the "Defenders of the Nifty" and Penny arcade has their official Fan club, both with membershhip dues, and each organization gets exclusive content as well as access to special promotions.
Hmm - running out of time to talk. More later (I hope!).