HI, you must be new here. Welcome! ;-)
There was a thread a while back about the "hit rate". I think mine's about 1/10 that I find interesting, probably 1/20-30 that I end up buying or thinking about buying. So with around 20-25 bottles, I've probably smelled 250-300 various things or so. But a few of those bottles I either probably knew I was going to buy before even smelling them or I already had.
also, I rarely ever "hit the counter" the same day as I smell something. I generally research, find a few names that sound interesting, got to the store to try those, plus check out anything else. If I find something I like, I get a sample, maybe a decant, and after at minimum 3 full wearings I might buy a bottle. Most frags never make it that far.