yes, you have indeed paid for the day that you want. And that is totally fine. Loads of people have told you that.
However, you are getting stroppy because people here have told you that your arrangements would not work for them, and that like your friends, they would not come. Which is also fine.
The fact that you have paid for the day you want co-exists with the fact that it is not a day some people would want to attend for a variety of factors, including: early starts; long periods of non-wedding related activities a fair distance from home; huge time commitment for a very long day; more expensive for guests to attend than the average wedding etc.
What you regard as special other people might regard as a huge hassle.
And those two views can both be valid.
the fact is that many people regard an 08.30 wedding and a 19.00 evening party as being too far apart for comfort. You think your wedding arrangements are perfect because they suit you and wonder why your friends are being non-committal at the moment. Well, maybe the answer I that they think the arrangements just don't work for them.
Which is fair enough.
Given the circumstances, YABU to be annoyed with your friends who aren't that bothered about travelling a fair distance just for an evening party and perhaps cannot commit to the entire day comprising of getting up early/driving to venue/attending ceremony/breakfast/early morning drinks/aimless wandering around in wedding gear for several hours/finding somewhere for lunch/getting ready for the evening in the ladies loos/more drinks/party/going home exhausted.
This is the day you want. it might not be the day your friends want to attend. They might just want to attend the ceremony and breakfast and then be home in time for lunch.