I found this on a forum.

If they can assure they can grow the 100 to 1000,000 or even 1000 as you said, they still need try so hard to carry out seminar and make money through the seminar?
Doing charity? or gain enough so try to distribute to others?
No offence. Just think the mindset is wrong to think attending seminar, one can turn into a pro trader.

It is impossible attending a few days seminar, then one can be pro in trading already.
It is all about experience and knowledge gain throughout the trading which make one good at it.

Even one is very good and clever, it still take sometimes to polish it to be better, definitely can't instantly turn one become a professional trader over a few days. 

Don't mean seminar is not good, but it is merely a part of process of learning and one of platform to gain some knowledge.

Whether those seminar is worth a few K or not, no comment on this part.