The ad thing   I dont know Sounds like too little gain for too much pain to me The pain includes people saying Look wikipedia now has ads in some form which is bad enough and the possibility of people later saying See those ads didnt break the thing so lets make IPs look at them which is far worse I really cant see the gain amounting to much considering that were now talking millions in yearly costs Nobody is going to pay us hundreds of thousands of dollars for ads unless we become a regular medium and we dont want to be regular right