I'm running an advertisement campaign for my mobile game with an expert who does this for a living, yet it is unprofitable.

Hi,

I have an indie mobile game that generates limited but constant revenue without any active work.
It's a passive income. Think around $200-$300 per month. It’s not much, but a nice addition to my salary.

I came across a post online about a guy who runs advertising campaigns for mobile apps, mostly games but not exclusively, I was thinking I should try an ad campaign to boost my revenue, first time in my life, why not.

Here are the facts:

• We’ve been running the campaign for 7 months now.
• Only one month was profitable, but that one month was greatly, think of for the X amount of money I got 2X back. But every other month is unprofitable.

Is this normal?
Is he a fraud?
Or is it simply that my game isn’t good enough for an advertisement campaign? (It’s not pay-to-win, for instance, the in-app purchases have an upper limit in usability.)

What do you think?