That is so wrong it is borderline delusional -- if 500 people are going to be drawn into the "sales conversion funnel," as they examine the product as presented to them -- some will fall off and won't buy;

1.) They were redirected to the product's website against their will (bulk traffic CJ skims) -- these show the poorest conversion ratios.

2.) If they acted on the website's banner or ad;

a.) the product does not meet their expectations. (Poor quality or value in the buyer's eyes)
b.) the buyer's questions or objections to buying are not answered or overcome by the sales approach of the website.
c.) the buyer doesn't have the available money. (Broke-Dick)
d.) the website does not offer acceptable billing terms. (Buyer does not like (or accept) the available payment options or his credit card is rejected for some reason (erroneous scrubbing).

At any rate, out of 50,000 potential buyers only 1:25, 50, 100, 500 or 1,000 are going to purchase the rest will be lost in the sales conversion funnel as stated above.

PT Barnum may have said that there is a sucker born every day but most of them will never buy from you if you expect to make a living off the few that will that makes you a sucker too I guess ...

There are "lay-down sales" and "tough sells" if you just skim for the lay-down buyer your sales will suck that is the ugly truth.

Everyone can't be a top seller there needs to be burger flippers at McDonalds too. Some can learn to succeed at selling and business and most cannot.

This phenomena of e-commerce has a short history and selling in the online world is very different than the bricks and mortar world. I was involved in face-to-face selling of medium to big ticket items for years I averaged 1:4 to 1:2 in my sales conversion but I realize with the selling methods of the Internet this could never be achieved.