If you want serious people to test your stuff then choose a few trusted users and pay up front +.011 and you'll get all the testers you need. The way this looks it's coming off as a scam attempt.
"do not waste our time" famous scammer quote
Or he can use escrow to provide funds. All other deal looks like a scam attempt.
I'm always curious, why people waste his time to devise new ways of fraud rather than a new legal job. In both situations, it's a must doing promotion, develop a script/website or whatever. however, many prefer to go on the dark side.