While I don't agree completely (servers cost money), the way so many wikis use ads is absolutely horrible. If you have so many ads it makes your website hard to use, we have a problem.
That said, I try to contribute to any sort of ad free resource I use on any sort of regular basis. I like when people are not trying to see me anything besides what I asked for, and I see it kind of like buying use of their product.
Hi! I'm actually looking for a starter tablet for this sort of thing as well. I see nobody responded here but did you have any luck finding what you are looking for?