:-) Making lure is more than just mixing a few ingredients together like a kitchen recipie. Lure making is a step by step process. All steps must be done correctly, aged and blended just right before the final product is compounded and bottled.
I dabbled in lure making years back. Some of my lures wern't so good, others were good but none were great.
One thing that becomes obvious when you make your own lure is that unless you use great quanities it doesn't pay. Making good lure requires top ingredients and additives. You don't buy some crap out of a grocery store and/or drug store, mix em together and presto= lure.
Like the others said, at the present cost of lure it's one of the cheapest expenses for the trapper.
Now all that being said, let me add this. Most all commerically manufactured lures very probably started out as someone's "home brew" for their own personal use. Go ahead, make your lure. Who knows you may be the next Herb Lenon, Stan Hawbaker, EJ Dailey or Russ Carman.