Just like different people have different personalities, Every church is different. Some are interested in outreach...others are internally focused (which is generally not a good model for a church...)
I wouldn't offer a donation for Sunday use. A good church is not in it for money. Fact is that Sunday is the "busy day" and they may simply have needed every space. I'd also be surprised if they made a big deal out of using it other days...if they did, that may tell me how I'd characterize the church. Matthew 10:8 commands us to "Freely Give".
Our last church spent $2million dollars to add on a health & fitness wing which we made available to the entire community for use - free of charge. The only requirement was that you sign a liability waiver. To our church, this was part of the mission - to challenge the stereotypical view of a church. We CAN'T change the message, but we can offer it in different ways that meet people where they are. We had to overcome the stereotypes set by bad churches... Just like we as cyclists have to be ambassadors to counteract the impact of rude cyclists...
I'm sure that many in this forum have had bad experiences with a church. I'm sorry that you've had these experiences, I cannot justify it, but I can say that there are good ones and bad ones...and just because the word "church" is in the name, doesn't mean that there mission is good.
If you don't grow where you're planted, you'll never BLOOM - Will Rogers