Poozie - you have every right to be disappointed!
Tbh - we are among the "stupid" parents who can't afford the full fees and yet we fork up. We are renting and all the money saved for a deposit is going into school fees. I have become a walking ad for how to mix and match a few pieces of Tesco's FF with George at Asda, eating out is a rare luxury and there are no more family holidays. If anything goes wrong, we'll have to move DS to the state sector as we have no safety net.
I can't tell anyone whether it is worth it or not. It is a deeply personal decision. What I can say, is that DS is exceptionally happy, has really lovely friends and is growing into a very charming, gracious, thoughtful young man. He is challenged academically and has many opportunities.
Would the local comp have been that different? Yes and no, but without being there, we simply can't compare. The curriculum is the same. In the top stream he would have been challenged. There, too, are really lovely boys (and girls!) and a few mean, disruptive ones. Class sizes may be bigger, but it might be easier to get into the sports teams and to shine academically.
This may sound like scant consolation, but I can absolutely assure you that Master Poozie will do well wherever he goes. He should know that he has done incredibly well to get to this point and use that to motivate his future success.