Unregistered, most of us come in here to learn from the larger parent group community. Sometimes we're surprised by the advice we're given. Know that it comes from our own unique perspectives and how we would handle something should it ever be presented to us.
While none of us know every side of your current situation, I see two red flags in your last post:
I don't think that is fair that I (should) with draw my bid
I would recommend that you focus less on what's 'fair' for you and what is 'best' for the team. Perhaps the team isn't handling the negative fallout as well as they could but digging in your heals because it isn't fair doesn't help. By being gracious and treating them the way you'd like them to treat you is the way to be a bigger person and lead by example.
I had already told the pto that I will let it be known what they did to me.
You've already sided against your team with this statement. What is to be gained by "letting it be known"? You'll be seen as sour grapes and if you're negative enough with your attack will probably turn the tide towards the very team you're trying to tear apart.
This is a tough spot you're in. You can use your disappointment and sense of fairness to change things for the future if you remain on the team, remain postive and encourage everyone to work together so this doesn't happen again. I'm assuming your team has bylaws. There should be a clause explaining the revisions process. Write up an ammendment or policy stating exactly what the bidding process is and who, exactly, can and cannot bid. It won't change things for you but it will show that your team can learn from their mistakes and move forward to make things better for the future.
Ultimately, the whole parent group experience is one long learning process. Many things drive change and the group will succeed if they can grow along with the change. My last team, for example, had a mandatory bylaws review/revision requirement every two years. This prevented the bylaws from becoming stale and forced us to keep up with the growth and changes around us.