Half divided to pool members = half of "normal" reward for most miners on most days. It is sufficient to cover electricity / operating cost.
That statement is where you're going to run into the most resistance to your idea. You're asking people to willing accept half of what they would normally get on the exceedingly slim chance that they might reap a significant reward should they be the one to find the block.
In my own case, I have 5 Antminer U2s solo mining on the off chance that they might solve a block, mostly because the power requirements to do so are virtually negligible. I also play the lottery in the off chance that I might win the jackpot, which is an interesting analogy to what you're proposing.
Let's assume for a second that you and a bunch of friends decide to play the PowerBall. You all purchase tickets and combine them together hoping that one of those tickets is a winner.
Normal pool:
If one of these tickets is a winner, we split the proceeds based upon how many tickets you contributed.
Your pool:
If one of these tickets is a winner, the person who bought the winning ticket gets half of the winnings and the rest of you split the remaining half.
Which pool are you joining?