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The actual price for the program is $20* which was set in 2007 (you can track this using Wayback Machine service. The price with the discount is less for the value of the discount, e.g. this discount offer will allow you to get the program $6 USD cheaper.
We really have the discount offers as well as other offers often (but not for months as you stated ofcourse)... but I do not see any problems with it. The decision to purchase the software at the discounted price or not to purcahse it is up to you. If you do not purchase it with the discount today, several days after the discount might not be available, so you'll pay more.

* $20 is the price for non EU countries, in EU VAT is included into the price so it costs more