title: Magento custom price rules for product
body: <p>Hello i need to use magento to sell a product that will have custom price rules.<br>
  the rule will depend by the quantity of this product sold.<br>
  I know that magento can make special rule, if a customer by ++ quantity of this product, but me i need to apply different rule and i cant find the way. <br>
  For example, product bought from customers first 100 times, price is :100$<br>
  product bought 200-500 times, price is 400$<br>
  500-1000times, product is 800$<br>
  1000 - > product is fixed price 1000$ <br>
  is it possible for magento to do this?</p>
  
  <p><br><br>
  Thank you</p>