Would it make sense to have a payment system in which the user who solves a block for the pool, gets an additional reward, i.e. 0.5 BTC or even 1 BTC?

This way there would be extra incentive to join, being given a shot at hitting a small jackpot without having to to mine solo against astronomical odds, while not taking away too much from the pool in relative terms?

I don't know if this has been discussed or done before, or even is being done... I think it could do well for the dynamic of a pool.