It matters I suppose if they depend on a figure but they don't expect it.
If income from giving is below expenses needed to operate the church then they need more to be given - it doesn't matter who gives it or what percentage it works out to be. If you are giving 48% and I am giving 3%, we both come to realise that the church needs an extra $2,000 in annual giving so you respond by increasing your giving to 56% and I respond by reducing my giving to 2%, why does it matter to the church as long as they got the money they needed?
I understand that if the congregation wants the church to do things then the money has to come from somewhere. What I give as a percentage of what I make is between myself and God. To be honest if a minister asked the congregation overall to consider increasing giving I wouldn't have a problem. If the minister told me that he expected me to give a certain amount he would soon find my giving dropped to zero. One thing (out of many) that I really respected about the pastor at my previous church was that he didn't know who gave what to the church. He wanted it that way and excused himself from any church discussions that might lead to him knowing how much individual people gave - he wanted to be sure that he allocated his time based on pastoral need without being tempted to prioritise someone who was basically having a whinge but who was a generous donor to the church.
They teach that God will somehow bless you financially in return but I honestly don't care about divine gambling lol no offense to anyone who believes that, I personally do what I can to be a good steward of the church either by small donations and or ushering.
I really take issue with churches that teach that sort of thing. If I give money to the church I regard it as being equivalent, from a purely selfish financial standpoint, to setting fire to the money. Literally - I had it and now I don't have it. If I want a return on it I'll invest it in the stock market or in a business venture. If I give it to the church I don't expect any personal financial benefit to result.
It's not as if blessings are for sale to the highest bidder, or the person who gives $10,000 gets blessed more than the person who gives $100. What Jesus said about the widow's mite seems particularly relevant where this is concerned.