I think going crazy with glowstone makes it look worse. It's a type of material that looks best when it's not too much of it. Anyway, the arena could use some better lighting. Perhaps add some glowstone in the floor in a thin spread circle?
About putting it on your cathedral, I would not recommend it. Things outside of regions will get griefed, especially if it is something nice. My underwater glass dome has been griefed countless times, and I doubt actually griefers get banned anymore. People send in /pe's for too many silly things now that the admins don't have time to fix the most important thing to threaten minecraft servers. So you can put glowstone on your cathedral, but unless it's high up so people have to pillar up with dirt to destroy it, I would not recommend it.
About evil fucks. Yes, most of the server is evil. That means that they lie and cheat and what not. They can pretend to be nice for several weeks, and then suddenly fuck you in the ass. As a town we have one way of defending ourselves: regions. Joining a town and then betraying it makes one banned from the server, so people don't do that, but jobs can be done and then betraying the region owner's trust without it being any wrong in terms of server rules. (Because being and evil asshole is allowed) So the trick with services is to have patience. We have haxnn who can make lifts and gates. No need to open the city up to potential raiders just because you want a lift or 2. Also, if you then have hired someone to make lifts it's very important to walk around with the person and looks what he is doing. If he deviates slightly from the job, remove him from regions right away or something.
An other thing about regions: letting non citizens have regions access is extremely dangerous. Not only about betrayal when it comes to raids, but there is a massive amount of griefing going on in the city. Every time I log in there is some glass or other stuff that has been griefed inside the regions that I fix right away. So there are griefers who has region access. They may be citizens or they may not. One thing to note is that there is no reason at all to let non-citizens have region access. The old "argument" helping with raids is just bullshit, because the best help against raids is just closing the city. We are safe unless someone lets them in. Having more people with region access than those who should build there is a liability. More people in region => bigger change of grief and backstabbing.
tl:dr:
1: People may grief you glowstone even if it's illegal. Griefers don't seem to get banned as effectively any more.
2: Don't hire people to do jobs unless you absolutely have to, and then walk them about and remove from regions if you're suspicious.
3: Don't add non-citizens to regions. They can't help us in raids and more people with access means bigger chance of getting griefed or the city opened to raiders.