Tithing is not a ridiculous idea. It is a principle and a practice that existed before the law. People tithe as the Lord leads them, not the churches.
First, if tithing is compulsory, why do people need to be led by the Lord? A bit like saying school is compulsory but we expect you to be led by the Lord about attending.
Second, Your comment that the churches don't lead people to tithe shows how gullible you are. Many churches, when they are struggling to pay their bills, will give lectures or pep talks about tithing. That is inevitable when you are running a religious organisation rather than advancing the kingdom of God where God supplies all your needs as he promised he would.
Third we don't teach tithing in my fellowship. We never ask for money and we don't pass round the hat each meeting. All we have is a box at the door. Now strange as it may seem, even though we do all these things, God blesses us and when we need money it is there. Mind you we don't pay anyone a salary and we don't have expensive buildings to finance. We prefer to concentrate our efforts on building God's kingdom and each individuals relationship with God. That doesn't take a lot of money but it does require commitment and faith in God's word. Sad to say it is easier and less demanding to give a tenth of your income. If you have done that your off the hook.
So what am I saying? God blesses us because even though we don't tithe money, we give ourselves so I guess that means we can't base any truth on subjective experience as you claim.