I've explained the issue before regarding uploads, there's an unsolvable bug (for now) where if you upload and it takes too long, the server rejects it. This is why we have "upload via URL" which as far as I am aware is functioning absolutely fine. This is not a specific to your IP address.
The newest items list, I've explained I will take care to not approve items too fast so they all get a look on this list. I appreciate you want to be on that list as long as possible and if you get bumped fast it's not a great situation but we are taking steps to address this as I've explained.
#3 I don't understand the issue I'm afraid, and have not heard of this before.
#4 Again, not aware of any problems with pricing.
We generally only work Mon-Fri, so any problems that hit Friday evening/weekend will probably not be looked at until the following week. Always happy to take a look at these issues if screenshots/steps to reproduce are sent.