From my experienced, Widgetbucks always changed their terms without any official notification to their publishers and then BAM! Publishers got booted because they has done something against their rules while they are allowed in the past.
For example, when Widgetbucks first launched they do not have rules which prevent publishers to place their ads on non-english sites. They changed this rules around October and no email or message or publish post in their own blog at all.
After a while, many publishers got banned due to following reasons and more.
I am surprised about this $10 million established company to not have even blog on their own domain. They used blogger as their company blog. They do not have even contact form or live chat support, just email. They had registered domain for one year only too. I had emailed them asked questions regarding to this and they never replied my email at all.
I did place widgetbucks as test on some spot on one of my site which earned around $30 a day from adsense with 500+ impressions and 20-30% CTR a day. The results? 0 clicks with 30 impressions a day!! I suddenly removed them off my site and never cared their $25 signed up bonus. and never looked back to them.