Heck yes, it's a hobby, and one of the best and most rewarding one's that you can find!
I would say go for it. I maintain large aquariums as a professional in my home town. There are soo many ways for you to save money and time and energy on doing routine things. For example, for every one of my clients, I use rubbermaid tubs for their sumps and fuges. Easier to drill holes for bulkheads etc. Just section off the rubbermaids with acrylic and eggcrate with some silicone sealant.
As for topoff and water changes, draw yourself out a system. use an RO Unit and a float valve to keep up with the evaporation rate in your sump. With a rubbermaid sump, that's easy! Also, I use two 25 gallon rubbermaids with float valves stacked one on top of the other, so the RO Unit will fill those up, you can mix your saltwater over the course of the week, and your bottom rubbermaid is used for old water. Take a powerhead and place it into your sump and drain water from your sump into your storage container, then use a bulkhead, ball valve and some PVC to either run it down the drain somewhere, or into some mountain spring bottles. Though, I would prefer just to tie into a drain.
All of that makes maintenance EASY and very very very fast. Also, through the use of simular materials, you can save yourself a TON of money and time.
Also, one more thing. You DO NOT have to use completely live rock in all the live rock that is going to be in your tank. Get some nice honeycomb base rock, and lay it on bottom, and then lay some actual live rock on top. That will save a lot of time and effort. With base rock, you don't have to worry about it drying out. Over time, your base rock will become live rock, just not taken out of the ocean.
There are so many things that you can do to save yourself time and energy. Just research and a little handy work will help.