Crossfit gyms do tend to be expensive. Where normal gyms may charge you $35 a month, they don't care if you show up or not and you are on your own. Should you want to take any classes, you often have to pay more.
Crossfit, on the other hand, is all class driven. This is great, as the whole routine is about intensity and most push a little harder in the class environment. Also, most gyms require a series of private training sessions to get you up to speed before you go into the WODs. Many of the lifts are technical and tehy want you to be able to perform them without too much risk of injury. We often do "tune-ups" with members at my gym prior to WODs with technical lifts (or for members weak in certain lifts).
Now, in terms of the "pyramid scheme" and extra seminars, I am not sure what you are talking about. There are certifications offered by crossfit across the country all the time. They are, by no means, required. We do an occasional seminar at my gym. It is at no cost and it may cover the fundamental lifts of crossfit or nutrition... no scams that I can think of.
I have been to several crossfit gyms across the country and never got that feeling. Now, if you were to say that tehy act like a cult.... well, that I really can't argue. Either you love it or you hate it. There really is no medium for most people.
There is nothing to say that you cannot do the WODs in a traditional, globo style gym. I did for over a year and a half until a gym opened in my area. They tolerated me (at best). All you really need is a squat rack, a lot of weight, a medicine ball, a rower, a pull-up bar and a section of free wall (for wallballs and handstand push-ups). If you can find somewhere to hang rings, you are really in good shape. 
Love it or hate it, few argue the good results that can be had. You are not killing yoruself, going heavy all the time. There are max load days every now and then, but anyone who has done a lot of them knows how hard they can be on yoru body. Everyday is demanding and it is always building on yoru cardio... even when not running/rowing. I got into it because of a back injury and I really have not ran in 3 years now. With that said, my fit tests have 1.5 mile runs and I am sitting at 10 min without much effort at all.
I worked really hard for a couple years to gain weight and strength. I was worried about losing strength and weight. I came into it benching about 350. My bench actually went up to about 385 without doing the normal (repititious) weightlifting routine.
I can't say that it work for everyone. I can't say that everyone would like it. I will say that it has worked for a lot of people in my gym (everyone from cops & firemen to middleaged soccer moms). I am a 200lb 38 year old still smoking most the younger in both speed and strength in the gym and on the street. It works for me.
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."In theory, there is no difference between theory and practice. But,
in practice, there is."
- Jan L.A. van de Snepscheut
"The difference between 'involvement' and 'commitment' is like
an eggs-and-ham breakfast: the chicken was 'involved' - the pig
was'committed'."
-unknown
Working on a PhD in CQB one doorway at a time.
When the wolf attacks, he will find not all who run with the flock are sheep!