Have you visited wikipedia lately?
There is a biiiiiig picture at the top, suposedly of the "founder" of wikipedia. In some words he begs for money.
Now if you use an ad blocker like I do it is likely to annoy you. So I try hard to ignore it and go about my business.
But why does he have to ask for money?
Wiki is a big website with lots of trafic but it is "free" to use. But hosting a big site with lots of trafic costs money and it seems there is not enough of it at wiki. And I think that the way it is going now there will never be.