I know for a fact that backercamp does a good job. I think you need to hear the hard truth that your products kind of suck man. I wouldn't even pay a dime for them. Quit blaming the marketing agencies for your failures. if you fail it is always your fault, either your product sucked, or you were too...
if you can't afford to risk $600, then you probably should quit trying to be an entrepreneur. seriously, what are you doing even wasting time hanging out in this form? you want to be a big shot? then get your asss to work and quit chatting around in forms. i just joined this form and im sorry to say...
If you have to ask if it's a scam, then 100% without a doubt then its a scam. Thats how those things work, if you have to ask, then its suspicious and it means that it is a scam. It's quite simple.
My friend lost $5,000 to funded today's upfront fee. He had me check it out after the campaign, and I am almost certain that they photoshopped things to show that they spent more money on ads than they really did.