Yeah the CTR rate is low and so is the actual CPM - they state $3 to $6 - in some sense it is true - you will most likely earn around $6 for 1000 widget impressions - NOT actual page views or uniques to your site however. I'm experiencing $6 for every 5000 page views roughly.
I'm getting some 2.5% on this my very first week with Widgetbucks, combining it with adsense. So far adsense was getting around 1%. I really think the widgetbucks modules are less seen than adsense ads, at least by now, so they produce less banner blindness. Just a thought
Not an option at this point in time - that I know of. I am guessing it/referrals will be tallied up at the end of the WB month cycle.
Correct THS, the referral money will be displayed in the My Bucks section at the end of the month. You can see a screen shot of it...http://www.widgetbucks.com/images/myBucks.png there.
As long as your visitors are sticking around for a while you'll do fine, you may find the widget will cripple your page for 3 to 10 seconds while it loads completely - depending on the amount of other goodies that need to load aswell - page is just harder to navigate while widgets load and some visitors will leave before the page loads. I've found Blogger is painfully slow with a couple of widgets on it.