I started playing (and finishing!!) the games in my backlog, but I'll probably buy more during the sale. It's like Sisyphus pushing his boulder up the hill. A financially irresponsible Sisyphus.
I've bought so many Humble Bundles over the years, including the Humble Monthly thing, that the majority of games in my library are games I've never heard of or have no interest in.
The value of my account is $2907, which isn't too bad given that it is 15 years old. That's basically $16/month.
Now, the number of hours played outside of the top 5 games is disturbingly low (or disturbingly high for the top 5, take your pick). Five games out of five-hundred and fifty.