I think the commercial aspect is what makes these small products viable. As a publisher your time spent provides you with a much greater reqard for these small PDFs. I have said it a number of times before, this is probably the only way to make PDFs a viable business, particularly for newbie publishers.
There are some people who, due to their pre-pdf credentials can make a decent amount of money on a proper sized book, but even some of these (i.e. the Game Machanics) split their print release up into smaller PDFs.
One phenomenon that still baffles me is EN Publishing. I suppose its largely the advantage of this site, but they do an incredible amount of sales of decent sized ebooks for a company with no regular print partner and no massive industry credentials.
So, if I'm sold on these mini-pdfs as being the best business solution, why don't a produce them myself? I thinkthis comes down to what inspires me to write in the first place. I am inspired by the RPG supplements I buy from other publishers and think 'hold on, I can do that' I feel I have the ability to design and write decent new mechanics and to layout such a book (although I can't draw for toffee). Therefore I try, in my own vain way, to emulate the works that have inspired my to write in the first place. I get a buzz from the flatering reviews of my products more from actual sales. I like to think that my products have teh abilityto inspire others as some peoples products have inspired me. Therefore I possibly shoot myself in the foot commercially, but i don't really care. I'm just someone who thinks 'I can do that' so I did. I just didn't want to go through life and say at the end 'I could have done that' but didn't.
Cheerio,
Ben