What exactly does it give me? What am I missing out on for not having it? And what happens afterward if I had it and then it expired?

Your not really missing anything without it. All it does is allow you to upload up to 100 projects instead of 10 at once, and each project can be up to 20 MB instead of the normal 4 MB limit. Basically, unless you need more space on the cloud, there's no reason to purchase gold.

Question: if I upload a game, and make 9 updates to it, am I able to remove the 9 prior installments to make space? Or am I only allowed to upload 10 times ever, no matter if I removed them?

You can remove the other updates and get space back.

Yess, thank you both Mystman and V360! That helps a lot. I won't buy the membership unless it's necessary. Quick question though, what if you DID have 100 games uploaded, and your membership expired...?

You can't upload any more until you remove 90 of them.

And they don't delete your work on their server?? Cuz that was my main concern about that. Thank you so much for answering, both of you. May I show my appreciation with accepting a drawing request? I usually do requests on this acc (I'm actually known as Gills, the artist)

Nope, they won't delete anything, they just lock you out of uploading any more projects until you delete enough from the server. This means, if your gold status expires, you can go onto the server, download any projects you need off of it, and nothing will be lost.

Ahh, thank you Mystman! That's a huge relief. Would any of you like a drawing request? Or no? :)