Sorry about this late reply Ziss, first time I've been on in months. Amsterdam is great for that sort of thing, or so I've heard....I have no real knowledge of buying a ticket like that, but I do know it's not really sold out unless AZ, PSV, Feyenoord or Twente comes to town. Or Champions League of course (*tears*).
For any other game you should probably be fine. Though I think you need to buy a Club Card if you want to buy tickets, I think it is something like 6 euro's for a few years, but you have to buy it in advance and it takes about 2-3 weeks I believe.