Before you go on with this, you should probably know a few things
1: It costs internet phishers approximately 500 US Dollars to send 5,000 mails.
2: Out of 5,000 mails, they will receive responses from around 40 people
3: All of their emails are templates that need to be adjusted slightly to fit the response they receive, so to answer 40 mails, it takes them approximately 20 minutes
4: Half of those will never reply again. The cycle will continue until they have success with between two and five respondees. The whole process, while possibly lasting weeks, will take them about an hour.
The whole point is that instead of telling them no, which saves them time, I would waste there time on my spare time. And make it drag.
And maybe in the end just say: sorry, the deal is off.
Bearing in mind it takes them 30 seconds to respond to you, and based on your posting style,I imagine it would take you quite some time preparing your emails to them, highlighting sections in bold
for no apparent reason, summarising your mail, and then summarising your summary. Who is the biggest loser (of time)?