Well this is what I think and its probably soley on my own opinion. You have to take risks to become big. I don't see a safe way to become big or else i'm sure everyone would be doing it (besides studying medicine or whatever). So either you risk it and make thousands a day or get little return. Or be safe and save some money but never make it out there. All in all whats $300-$500? thats like working 2 full days.. anyways so i dont think thats such a huge risk at all. I seen people selling all their assets including their house just to bet in 1 roulette game and same even spending all their assets on a website and fail. So $300-$500 is really not a worthy investment really...
Is there a big crossover with the youtubers audience and the people you're targeting for your app?
$300 - $500 does seem reasonable for something like this but it's unclear if you'll actually make a return.
How much does your app cost? How many people out of those 200k will have iPhones? What % of those people will have an interest in your app? What % of those people do you think will actually care enough to open the app store and pay/download your app?
I don't know the answer to any of these questions but maybe you do.
First off this guy has no clue about who's watching his videos. He probably has no marketing background and just came up with a random 'sounds good' price.
You'd have to at least have a contract for how many views it gets, otherwise you might pay $500 for a video that get 20K views. Also the content of the video would be very important, it would need to attract people that would like your app.
What kind of ads are running on his videos now? Remember, if he's not running ads on most of his video, he should be more flexable on the price.
You might try to track a few of his videos and see if the numbers come in early or late, then ask about running the ad for 1 month only for say $75 and state in the contract when you want it to run in relation to when the video comes out.
In other words, if his videos peak on average at 150K but does 80% of that in the 1st week, then the ad would be worthless except for the 1st week, as the video has run it course.
It has the potential to have thousands of downloads, but then again it might only generate a couple. So what do you guys think, should I do this or is it too risky?
I'd like to offer a practical answer: youtube reviews have been around for a while. If they had worked well or at least ok, we would have discovered this long time ago and this forum would have been full of accolades to youtube reviews.
Since I find none of these, I am 99% sure this would be a waste of time and money.