Quote from Hook N. Sinker:
Marketplaces provide a service known as price discovery to answer the question "what is the correct price".
You might bid $ 5. If that bid is not accepted then bid $ 10. If that bid is not accepted then bid $ 15. If that bid is not accepted then bid $ 20. Keep raising the bid until you feel the item is overpriced or you do not have enough money to purchase. If there is no trading then quit and repeat the process later.
The method seems to work well for trading crude oil futures, silver futures, corn futures, stocks, bonds, currencies, so maybe it works for trading systems too.
<img src=http://www.onpointradio.org/content/2003/06/26/0626feds140.jpg \img>
I think open outcry and colored jackets are optional in this case.
Thank you. I think it works. But $10 for a "profitable trading system" seems to be a little bit impudent specially in first bid.