Actually, Webmoney use Ukash so that their customers can top up their wallets using cash
http://wiki.wmtransfer.com/wiki/show/UKash?q=ukash
http://www.ukash.com/uk/en/where-to-.../webmoney.aspx
Most of the gaming industry use Ukash also. Adult webmasters can now use them too
http://www.ukash.com/business/emjay.aspx