Note that I defined/proved the non-existence of a market at $5000 (in exchange for 20 minutes of any operator's personal time) and you countered by claiming a (possible) willingness to pay at $500. Thus proving my point. It doesn't really matter what reason you gave, which in your case was trust. Ordinarily that could be countered with escrow or a lack of up-front payment, but this still does not happen, that market still doesn't exist. You can't pay someone whatever revolutionizing your marketing is worth, after you've given them a chance to do so in just 20 minutes and seen, "yep, that works". Doing so would feel wrong to you.

"I'm not saying that there isn't a person out there who can revolutionize my marketing in 20 minutes" - I'm saying you wouldn't pay them to do so in line with what doing so would/should be 'worth' to you. There is no market to pay to revolutionize your marketing in 20 minutes, at a pricing that is based on what it should be worth for you to do so. Doesn't exist. You wouldn't pay it. Imagine what "revolutionaizing your marketing" means, image what "revolutionizing your marketing" would be worth to you - do you have that figure in mind? Now imagine paying that to someone for 20 minutes of their time. You wouldn't. Neither would anyone else. That market doesn't exist.