I would say that we shouldn't delete honest inquiries, but rather point them to threads that answer their questions. Maybe even write up a "read me first" sticky explaining common fuel farces. Also, possibly moved to the unicorn corral
On the other hand, if someone is spamming (hull effect, powerstroke flaming guy) or scamming (selling snake oil) then I say ban away. When I say spam I mean something that contributes nothing to the community, flaming or touting huge gains but not explaining how, etc. When I say scamming, I mean someone is trying to get people to buy a product without showing some sincerity or willingness for 3rd party testing.
There you have my two stamped zink disks, coated in copper.