It was worth it for me at least...Here is my Dolby Atmos story:
Started out wanting a new receiver, went to BB, got a display Marantz SR7009 that was very inexpensive, my son said get it Dad, that's when my venture into the rabbit hole begun...started upgrading my older legacy speakers to ML, bought a second sub ML 1500. Then I bought some on-ceiling speakers, two at first, now I'm at Dolby Atmos 7.2.2, then I wondered about adding two more to get better immersion, bought two more on-ceiling speakers and a crown 2 channel amp (my older Rotel 2 channel amp went south), thinking I could always return if it is not a significant sound improvement. Atmos 7.2.4., was significantly better, so beware, just save yourself some time install 4 speakers, the immersion effect is much better.
I still listen to 2 channel music, but every now and then, DTS Neo:X Music, sounds great...In all I spent significantly more money than I thought or should have, but I am totally happy with my results. BTW, I have a dedicated HT room with acoustical paneling and my wife hardly even comes down, but that doesn't bother me that much, because I can upgrade without much fanfare.
This is my hobby, some play Golf, some ride Motorcycles, etc...I'm certain when I sell this house, they will want to keep the HT room intact, which should make the house more appealing to a buyer. My friends come over and love it, then they ask can I help them build one. I ask "are you sure", some say yes some say no. I don't mind providing consults for my friends.
In total when I finished, (took about 6 months), I've spent ~$3500K, didn't start out that way..BTW, all my upgraded ML speakers, were out of box pricing, good thing I couldn't afford full price. Remember in HT and IT, "buy cheap buy twice"...Hope this story helps you or someone else along the way, YMMV, of course...
Peace and blessings,