New GA/Raffle group idea

So I was wondering about just another GA group which is gonna be like this - A group of 15-20 members. I see how in every other group they say a GA per month is compulsory and thats not very fair since most of them make bundle games giveaways. So I was just thinking how about using money instead! Every member gonna donate $1 every month (or more, out of generosity if they want) using paypal or some fundraising site. Then I am gonna create a GA worth 20$ of a game (if there are 20 members and each member gives 1$). To make sure that i dont earn profit off of it, I am gonna make sure its a steam gift everytime. Each member gets a pretty high winning chance at a low cost. I am also gonna enter and donate my share :)

Either THIS^ or another RAFFLE group.

Please point out some drawbacks and solutions to overcome them if this is flawed. Also I'll be looking for some members to make this group happen. Rules for entering (for now) would be having created at least 1 GA here on SG and contributing 1$ on joining.

Looking forward to your comments (I hope I dont have to go with Raffle)