I wish we could put a disclaimer on this section: Astrophotography - it's hard!
I love that people want to get the amazing pictures that are seen here but I don't think most realize what's really involved. Spending a lot of money in this sub-hobby is not the same as ditching your kit lens and buying a $1500 L lens. At least with that you can get some amazing pictures from the first click of the camera because you already have the knowledge to use it. You don't have to ask, "How do I connect my L lens to my camera body?"
In astro work there's a HUGE, and I mean HUGE learning curve. As in YEARS of reading, learning, practice, failure, success. There are HOURS of late cold nights, late hot nights, late nights with lots of bugs & even late nights with nothing usable the next day. There are hours learning & using the software involved to process those images from those late nights. You'll be learning what equipment is compatible with what and what accessories are must have and what accessories are for convenience.
So many people buy a cheapo telescope for Christmas or a birthday, use it a couple of times and then let it sit in a closet for years. I'd hate to see someone spend a lot of hard earned money on "the right" setup and then not use it. Many would probably realize that to get a nice studio type image they can (don't have to) buy the backgrounds, Alien Bees, reflectors, etc. but that after those shots are taken they'd rarely use that equipment again...so they don't buy it. Consider these as specialty shots.
You can spend the national budget of a small country on equipment. Please realize that none of us won a lottery (I don't think). Most people start off with a small scope and upgrade in steps as they see the limitations of that scope. Thus when you buy that $2000 scope or mount you're most likely selling a $1500 item and adding another $500. On the bright side, astro gear holds its value very well in most cases so you can generally get most of what you paid for an item. I'd be curious to know what everyones "first scope" was. Mine was a $200 4.5" reflector 10 years ago. That hooked me. Many get hooked just using binoculars. If you're entry level budget is higher, that's great. Better quality equipment with the right knowledge equals better images.
Keep in mind, you're esentially trying to learn 2 hobbies at the same time. Just the astronomy side can be mind boggling. Then the astrophotography part is so much different than daytime photography that it should be considered its own hobby all by itself.
I don't want to discourage anyone from getting into this arena by any means. I just want you to know that it's tough, tiring, and expensive. It's also hugely rewarding to be able to get & share beautiful images with others. In many cases those people don't know this stuff even exists.
So if you have a reasonable remaining life expectancy, start small, get some astro-buddies, join a club, use other's equipment. Come visit me, you can use my stuff. Get hooked. The stars aren't going anywhere.
If you're up there in years, blow your kids' inheritance. Have fun!
All my best!