Project Wonderful-Yes or No?

I like the idea of Project Wonderful, but question how helpful it really is. To those who don't know, it's a site where you can bid to have an ad you've created placed on someone else's website or blog, hopefully to gain more exposure and therefore business. The trick is to keep your bid the highest to keep you from getting bumped off the persons site. It can be very frustrating. Of course there's also the ability to place ad space on your own site so that you can host ads, earning some extra income. Some of you have probably noticed I've played with adding advertising space to my blog...small ads, larger ads, 0 cost ads, paid ads.......and over time I've earned something like $0.28. Trouble is I've denied most ads because they are totally irrelevant to my blog. I just don't think 'cartoonists' sites 'fit'. And it seems, after spending literally hours on the Project Wonderful site looking for relevant ads, 90% seem to be cartoonists, 5% how to make money, and the remainder some jewelry and craft artists (which are fine, but they don't seem to have much traffic going to their sites yet). Bidding on sites that don't get much traffic seems fruitless as far as gaining exposure. Sites that do have lots of traffic, I can't afford to bid on......sigh.
Maybe I'll just keep a small ad box on my site at 0 cost for now to help some of those creative folks get some more exposure, if one of them wants to up the ante by a penny or two, fine.
Anyway.......in the spirit of helping I thought I'd share a couple of the 'advertisers' whose sites I did like.
*http://dvinedesigns.blogspot.com/
(I even placed an ad on this one :-) Also visit her etsy shop here.
I actually like visiting etsy shops, the prices always seem so reasonable (ie affordable :-).

*http://foldingtrees.com/
As the name suggests, this is all about paper.

*http://dollarstorecrafts.com/category/tutorials/
I love the creativity of this one. More than once I've been in a 'dollar' store and thought some of the things they carried were actually pretty cool. This is actually from the tutorial page.

* http://www.ni-cherndesigns.blogspot.com/
I love Nicoles sweet little purses.

*http://toy-a-day.blogspot.com/
Here's one thats just fun.
Let me know your experiences with online advertising.