I started on kits for the same reason as a lot of ppl i guess: cheap beer!
After a few of the Coopers kits I started steeping grains and dry hopping. Then I got sick of bottling, seriously that is the shittest thing to have to do, all the cleaning, fiddly crap etc. so I went out and bought a kegging setup, butchered the beer fridge and was pretty happy at that point until I started wanting to do beers other than ales.
This is I think where AG started to make its case pretty compelling. I remember doing a couple pilsners with extract (by this stage I had moved on from straight out K&k). I did everything by the book eg wyeast urquell, fermenting in the right range, secondary fermentation, conditioned for a few weeks etc.
It still had *that* flavour.
So I hit up my local Asian grocery store and got a cheapy 80L pot for about $50. Got some nylon and made a bag. Got a 4 ring burner from the camping store.
My first BIAB was an ale, missed most temps, spilled a heap of stuff and burnt myself a fair bit.
Bloody beautiful beer though! It was my worst AG but was still better than any of my extract/kit ales.
After a couple more brews I tried out the pilsner. From memory it was about 95% Bo pils and 5% wheat. Fermented at the right temp, secondary and conditioned etc.
It did not have *that* taste!!!
That was it for me, completely sold. Bought an esky, made a hlt out of an old fermenter and a kettle element and never looked back.
Since going AG ive spent more on this hobby than I originally intended to but then again my intentions are now different than they were. Now I'm more concerned about perfecting my regular brews, experimenting with other ingredients (fruit is awesome) and basically having a great time.
I'm brewing small 20l batches (ie 1 keg) so that I can brew more often and I've got my brew day down to 3hrs with my new rig.
So I guess that's why AG is the ****. Not knocking kits or extract but AG removes the limitations.