A radio show can always make a more horrifing moster then a TV show or movie because you can't see it. Romney by not showing his taxes is making them appear much more horrible then they probably are. This foolish policy means that everyone will speculate what the problem is. Everyong will build on everyone elses speculation making whatever, if any the problem is bigger and bigger. More and more terrible. Now when we finally see this "problem" we maybe disappointed but likely what ever it is will appear much worse then it would have if he'd shown them a year ago.
As to tiething to the church there is a yearly tiething reconciliation with the Bishop. Even as a high priest Romney would be expected to go to one of those, as the Bishop is the head of the ward. Bishops are responsible for ward finances. These reconciliations are voluntary but generally everyone knows who goes.
Another problem is that with all the publicity there is going to be pressure on the IRS to do an audit. If Mitt is called in for an audit it will be bad publicity.
All this leaves the conclusion that Romney's business experience has left him feeling like a king. He doesn't think he is responsible to anyone by himself and that would make him a poor choice for President.