you specifically said, if I'm qualified to shoot this 3 gun, why I'm not qualified to shoot ipsc... though your course you took may have been the bomb, I'm sure you can appreciate that not every training course out there is good, but can be poorly executed, thus passing on less then steller training to shooters, also giving false sense of qualification and maybe even making the shooter unsafe, unknown to themselves..
I've personally have seen basic firemarms club level course that was very sub-par and felt bad for the new shooters going thru it... but not my place to step in and correct and better half the things being taught..
That said, you don't know if the ipsc bb course is the bomb or not, but you're hearing all the praises from most on here about it's validity, and there must be good reason when high % of people whom have actually taken a BB course are saying it's worth it..
so, you asked the question and most have answered why it's worth the price...
if you weren't thinking you'd receive such positive info on it, you shouldn't have bothered to post the question...
Re: cost of gear and ammo... thats all up to you.. many ipsc shooters keep it basic and don't expect to win matches, but havin a hell of a blast and that's what its about, as is 3 gun, idpa, cowboy action, etc...
You don't think it's worth it, then no worries. But if have chance to go to idpa, ipsc matces come your way, go hang out and shoot the sh!t and check it out...
all shooting is good shooting...
so, only makes sense that a very well organized group like (ipsc), other than the politics.. would want to know their members have been trained accordingly to shoot safe in such a dynamic style of shooting...