While I agree to a point, what if they are using the money to fund another firearm purchase? The law requires an FFL to make a living off of. What if someone is trying to purchase that full auto Thompson SMG they've been dreaming about?
Would it then be ok to have a separate saving account setup to transfer the funds to sit in until the firearm can be purchased?
I see that as an acceptable action under current law, and it would require strict paperwork and such.
If someone is turning a profit to eat or provide, then that's needing an FFL. But if someone is turning a profit to buy something crazy expensive that is a firearm, then I see no problem with it legally.
I'm also not a BATFE agent, lawyer, or judge. I am a person that sees a flaw in the NICS and FFL system. There needs to be something in between C&R and fully licensed dealer. Perhaps a hobbyist FFL license, strictly funding gun purchases, and the only requirement being keeping strict papers and a separate bank account.
I have a feeling the BATFE is going to view income as income. It doesn't matter what form it comes in or what it gets spent on. The amount of income probably has some significance, but we don't know where that line is. Raising eyebrows with a scrap over an automatic weapon may very well lower that threshold of significance in the eyes of the BATFE.