Because people would generally rather believe what sounds sexy than the truth. People want to believe that degree numbers equate into some sort of rank, power, or authority. They do not. Never have.
The core of freemasonry is the 1st (Entered Apprentice), 2nd (Fellowcraft), and 3rd degrees (Master Mason). This is the original freemasonry before any side order, and all members reach the 3rd degree in 3-12 months, depending on their lodge and the candidate's desire to advance. Upon reaching the third degree the member is the highest degree in terms of rank, authority, and power. There is no higher degree.
The 32nd and 33rd degrees are offered by one side order of freemasonry, called the Scottish Rite. It is just ONE side order - there are quite a few. In the US, the main two side orders are the Scottish Rite and the York Rite. For sheer convenience sake, the Scottish Rite numerically orders its numerous side degrees (ending in 33). The York Rite does not, although it ends in a degree called Knights Templar. Members join either order based on their preference and a 32nd or 33rd degree mason of the Scottish Rite is no "higher" than a Knight Templar in the York Rite nor is either higher than a 3rd degree master mason.
In fact, in order to maintain membership in orders like the Scottish Rite (which have the 32 and 33 degree masons) you must remain in good standing with your blue lodge (where you received the 3rd degree).
The same in terms of what? Yes, they are the same in terms of rank, power, and authority - exactly equal. The only difference between a 32nd and 33rd degree mason is that the 33rd degree is by invitation of the Supreme Council to a brother mason who has made extraordinarily contributions to the fraternity or society. Its a honorary degree for doing a lot for your community - think of it as a community service award. There are no "lower level masons" or "higher level masons." Degrees beyond the third degree come from side orders and do not convey any additional knowledge, they simply build upon the first three degrees.
Freemasonrywach bases its claims on debunked hoaxes like the Leo Taxil hoax, which have been proven false for years:
http://en.wikipedia.org/wiki/Taxil_hoax
The Leo Taxil hoax is the source of these "demonic" claims, which Taxil later admitted he completely made up.