Your ROI would not make me feel good.
I think anything close to an even return on any advertising campaign isn't necessarily a bad thing, especially if you are a young business hungry for growth, and can financially handle some extra work even if it does not immediately pay off. Considering the fact that some campaigns can be complete flops, breaking even in the moment may not seem too bad.
I think other variables must be considered other than the immediate return it has generated.
Gotta factor in the potential for repeats, future referrals, new connections, exposure...etc.
Good suggestions to try to make a deal now that you are more familiar with how they work, and you might be able to tweak the numbers more in your favor.