There are more credit card and PayPal users than Bitcoin users. For the same reason, there isn't a button for bank wire or cheque or whatever else they accept there.
But there are also many people that use bitcoin
, however I think you are right but if they will add the bitcoin button donation in the first page they (wikipedia) will receive a lot of donation
( That's sure).
I know this but I 've asked another thing :
Hey guys look ak this screen ( 10/11/2014 )
in your opinion why they didn't put the bitcoin button donation near the paypal / credit card buttons ?http://imgur.com/pAOytSEWhat is your opinion ?