I say yes, and you don't even have to share. It's your work and you have the right to keep whatever it earns you.
Just, you know, don't make it obnoxious. Show an ad somewhere to the side, or when a level is loading, etc. If it becomes a bother, people are more likely to just drop your game than click on the ads... at least I would.
Ads really don't bother me at all and I kinda think that if you're really that pressed then it's fair that you keep the money until you're afloat, if the majority is fine with ads then you can give that money to the club afterwards, or take it down if it's that bothersome..
Ads are fine as long as they are tastefully done, not intrusive, and don't violate privacy through tracking and other shenanigans. Since I don't foresee any of the above being a problem coming from you then I think that would be a fine way to help line the pockets in return for some enjoyment.
Yep, I just uploaded a test 'worst case scenario' for when I start living on some 'riverfront property' beneath Vanowen Street. What's nice about the system I've signed up for is that their ads have some utility as well. You can see that one for a glimpse of what I will do at maximum. One during the preloader, and one that doesn't even overlap anything in the play area. I redesigned the puzzle layout so I could have a corner ad that doesn't obstruct gameplay.
So if you guys would like to weigh in more knowledgeably on the subject, give it a glance.
IMHO adds, are more than a way of earning some cash, be wary what adds you add and how you do it... In order to make them lucrative, try to match the adds to your game's target market... Bad handled adds can be annoying, while good handling of them can be not only lucrative for you, but also a good experience for the gamer...